public void ConfigureServices(IServiceCollection services)
 {
     services.AddControllers()
            .AddNewtonsoftJson()
     // ...
}

public class Person
{
   public string FirstName { get; set; }
   public string LastName { get; set; }
   public DateTime? BirthDay { get; set; }
}

using System;
using System.Text.Json.Serialization;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            Person person = JsonSerializer.Parse<Person>(...);
            string json = JsonSerializer.ToString(person);
        }
    }
}

namespace System.Text.Json.Serialization
{
    public static class JsonSerializer
    {
        public static object Parse(ReadOnlySpan<byte> utf8Json, Type returnType, JsonSerializerOptions options = null);
        public static object Parse(string json, Type returnType, JsonSerializerOptions options = null);
        public static TValue Parse<TValue>(ReadOnlySpan<byte> utf8Json, JsonSerializerOptions options = null);
        public static TValue Parse<TValue>(string json, JsonSerializerOptions options = null);

        public static string ToString(object value, Type type, JsonSerializerOptions options = null);
        public static string ToString<TValue>(TValue value, JsonSerializerOptions options = null);
    }
}

public sealed class JsonSerializerOptions
{
   public bool AllowTrailingCommas { get; set; }
   public int DefaultBufferSize { get; set; }
   public JsonNamingPolicy DictionaryKeyPolicy { get; set; }
   public bool IgnoreNullValues { get; set; }
   public bool IgnoreReadOnlyProperties { get; set; }
   public int MaxDepth { get; set; }
   public bool PropertyNameCaseInsensitive { get; set; }
   public JsonNamingPolicy PropertyNamingPolicy { get; set; }
   public JsonCommentHandling ReadCommentHandling { get; set; }
   public bool WriteIndented { get; set; }
}

// Json.NET:
var settings = new JsonSerializerSettings
{
    NullValueHandling = NullValueHandling.Ignore
};
string json = JsonConvert.SerializeObject(person, settings);

// JsonSerializer:
var options = new JsonSerializerOptions
{
    IgnoreNullValues = true
};
string json = JsonSerializer.ToString(person, options);

services.AddControllers()
   .AddJsonOptions(options => options.JsonSerializerOptions.WriteIndented = true);

[JsonPropertyName("birthdate")]
public DateTime? BirthDay { get; set; }

var options = new JsonSerializerOptions
{
   PropertyNamingPolicy = JsonNamingPolicy.CamelCase
};
string json = JsonSerializer.ToString(person, options);

    var ms = new MemoryStream();
    using (var writer = XmlWriter.Create(ms))
    {
        EdmxWriter.WriteEdmx(new Context(), writer);
    }

    var xDoc = XDocument.Load(ms);

    var ssdl = xDoc.Descendants("{http://schemas.microsoft.com/ado/2009/02/edm/ssdl}Schema").Single();
    var csdl = xDoc.Descendants("{http://schemas.microsoft.com/ado/2008/09/edm}Schema").Single();
    var msl = xDoc.Descendants("{http://schemas.microsoft.com/ado/2008/09/mapping/cs}Mapping").Single();

 EdmGen.exe /mode:ViewGeneration /incsdl:Context.csdl  /inmsl:Context.msl /inssdl:Context.ssdl /outviews:Context.Views.cs

using System;
using System.Data.Entity;
using System.Data.Entity.Design;
using System.Data.Entity.Infrastructure;
using System.Data.Mapping;
using System.Data.Metadata.Edm;
using System.IO;
using System.Linq;
using System.Xml;
using System.Xml.Linq;

namespace EfUtils
{
    public static class PreGeneratedViewsWriter
    {
        public static void CreatePreGeneratedViewsFile(
                this DbContext contextInstance,
                LanguageOption language = LanguageOption.GenerateCSharpCode,
                string viewsFile = "Context.Views.cs",
                string edmxFile = "context.edmx",
                string ssdlFile = "context.ssdl.xml",
                string csdlFile = "context.csdl.xml",
                string mslFile = "context.msl.xml")
        {
            using (var contextViewsMemoryStream = new MemoryStream())
            {
                using (var edmxMemoryStream = new MemoryStream())
                {
                    var edmx = createEdmx(contextInstance, edmxFile, edmxMemoryStream);
                    var mappingItemCollection = createMappingItemCollection(ssdlFile, csdlFile, mslFile, edmx);
                    generateViews(language, viewsFile, contextViewsMemoryStream, mappingItemCollection);
                }
            }
        }

        private static void generateViews(LanguageOption language, string viewsFile, MemoryStream contextViewsMemoryStream, StorageMappingItemCollection mappingItemCollection)
        {
            var viewGenerator = new EntityViewGenerator // It's defined in System.Data.Entity.Design.dll
            {
                LanguageOption = language
            };
            using (var streamWriter = new StreamWriter(contextViewsMemoryStream))
            {
                var errors = viewGenerator.GenerateViews(mappingItemCollection, streamWriter).ToList();

                if (errors.Any())
                    throw new InvalidOperationException(errors.First().Message);

                contextViewsMemoryStream.Position = 0;
                using (var reader = new StreamReader(contextViewsMemoryStream))
                {
                    var codeData = reader.ReadToEnd();
                    File.WriteAllText(viewsFile, codeData);
                }
            }
        }

        private static StorageMappingItemCollection createMappingItemCollection(string ssdlFile, string csdlFile, string mslFile, XDocument edmx)
        {
            var ssdl = edmx.Descendants("{http://schemas.microsoft.com/ado/2009/02/edm/ssdl}Schema").Single();
            ssdl.Save(ssdlFile);
            var storeItemCollection = new StoreItemCollection(new[] { ssdl.CreateReader() });

            var csdl = edmx.Descendants("{http://schemas.microsoft.com/ado/2008/09/edm}Schema").Single();
            csdl.Save(csdlFile);
            var edmItemCollection = new EdmItemCollection(new[] { csdl.CreateReader() });

            var msl = edmx.Descendants("{http://schemas.microsoft.com/ado/2008/09/mapping/cs}Mapping").Single();
            msl.Save(mslFile);

            var mappingItemCollection = new StorageMappingItemCollection(edmItemCollection, storeItemCollection, new[] { msl.CreateReader() });
            return mappingItemCollection;
        }

        private static XDocument createEdmx(DbContext contextInstance, string edmxFile, MemoryStream edmxMemoryStream)
        {
            var settings = new XmlWriterSettings { Indent = true };
            using (var writer = XmlWriter.Create(edmxMemoryStream, settings))
            {
                EdmxWriter.WriteEdmx(contextInstance, writer);
            }
            File.WriteAllBytes(edmxFile, edmxMemoryStream.ToArray());

            edmxMemoryStream.Position = 0;
            var edmx = XDocument.Load(edmxMemoryStream);
            return edmx;
        }
    }
}

 Database.SetInitializer<MyContext>(null);

1. بررسی وجود کتاب
2. بررسی تعداد موجود یک کتاب در کتابخانه
3. بررسی وضعیت امانی کتاب (آیا کتاب در دست کسی از قبل امانت است؟ یا کتاب برای امانت آزاد است؟)
4. در صورتی که کتابی بیش از زمان مورد نظر در دست کسی امانت است، با یک پیامک از او بخواهیم که کتاب را بازگرداند.

    class Book
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public int Quantity { get; set; }
        public bool IsLoanable { get; set; }
    }

 class User
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public  string CellPhoneNumber { get; set; }
    }

  class Loan
    {
       public DateTime ExpiredDate { get; set; }
        public User User { get; set; }
    }

 class BookManager
    {
        public Book GetBook(int id)
        {
                return new Book()
                {
                    Id=id,
                    Title = "a book",
                    Quantity = 3,
                    IsLoanable = true
                };
        }
    }

 public int IsLoan(int bookId)
        {
            return 2;
        }

        public List<Loan> GetLoans(int bookId)
        {
            return new List<Loan>()
            {
                new Loan()
                {
                    ExpiredDate = DateTime.Now.AddDays(-15),
                    User = new User()
                {
                    Id = 2,
                    Title = "User1",
                    CellPhoneNumber = "342342424"
                }
                },
                new Loan()
                {
                    ExpiredDate = DateTime.Now.AddDays(5),
                    User = new User()
                        {
                            Id = 56,
                            Title = "User56",
                            CellPhoneNumber = "324324324324"
                        }
                }
            };
        }

   class SmsManager
    {
        public void SendMessage(string number)
        {
            Console.WriteLine("please take back the book to the library : "+number);
        }
    }

    class FacadeBookLoan
    {
        private readonly BookManager _bookManager;
        private readonly LoanManager _loanManager;
        private readonly SmsManager _smsManager;
        public FacadeBookLoan()
        {
            _bookManager = new BookManager();
            _loanManager=new LoanManager();
            _smsManager=new SmsManager();
        }

        public int IsLoanable(int bookId)
        {
            var book = _bookManager.GetBook(2);
            if (book == null)
                return -2;
            if (!book.IsLoanable)
                return -1;
            var howManyBookIsLoaned = _loanManager.IsLoan(bookId);

            if(howManyBookIsLoaned>0) ManageLoaners(bookId);

            return book.Quantity - howManyBookIsLoaned;
        }

        private void ManageLoaners(int bookId)
        {
            var loans = _loanManager.GetLoans(bookId);

            foreach (var loan in loans)
            {
                if (loan.ExpiredDate > DateTime.Now)
                {
                    _smsManager.SendMessage(loan.User.CellPhoneNumber);
                }
            }
        }
    }

var myfacade=new FacadeBookLoan();
var loansCount= myfacade.IsLoanable(2);
Console.WriteLine(loansCount > 0 ? "you can loan the book" : "you can't loan the book");

please take back the book to the library : 324324324324
you can loan the book

namespace CS72Tests
{
    public struct DataInfo
    {
        public double A;
    }

    public class RefReadonlyExamples
    {
        public DataInfo ReturnBiggestA(in DataInfo data1, in DataInfo data2)
        {
            return data1.A > data2.A ? data1 : data2;
        }

        public ref readonly DataInfo ReturnBiggestARefReadonly(in DataInfo data1, in DataInfo data2)
        {
            if (data1.A > data2.A)
            {
                return ref data1;
            }
            return ref data2;
        }

        public void TestingRefReadonly()
        {
            var data1 = new DataInfo { A = 0 };
            var data2 = new DataInfo { A = 100 };

            var biggest = ReturnBiggestA(data1, data2);
            biggest.A = 42;


            var biggest2 = ReturnBiggestARefReadonly(data1, data2);
            biggest2.A = 99;


            ref readonly var biggest3 = ref ReturnBiggestARefReadonly(data1, data2);
            biggest3.A = 99; // ERROR: The left-hand side of an assignment must be a variable, property or indexer
        }
    }
}

public static void Add(ref readonly int x, ref readonly int y, ref int z)
{
   z = x + y + z;
}

StartupUri="AddRequest.xaml"

•System.Activities
•System.Activities.DurableInstancing
•System.Configuration
•System.Data.Linq
•System.Runtime.DurableInstancing
•System.ServiceModel
•System.ServiceModel.Activities
•System.Workflow.ComponentModel
•System.Runtime.DurableInstancing
•System.Activities.DurableInstancing

<Window x:Class="PersistWF.UI.AddRequest"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="520" Width="550" Loaded="Window_Loaded">
    <Grid MinWidth="300" MinHeight="100" Width="514">
        <Label Height="30" Margin="5,10,10,10" Name="lblName"  VerticalAlignment="Top" HorizontalAlignment="Left" Width="90"  HorizontalContentAlignment="Right">Name:</Label>
        <Label Height="30" Margin="270,10,10,10" Name="lblPhone"  VerticalAlignment="Top" HorizontalAlignment="Left" Width="90"  HorizontalContentAlignment="Right">Phone Number:</Label>
        <Label Height="30" Margin="5,40,10,10" Name="lblEmail"  VerticalAlignment="Top" HorizontalAlignment="Left" Width="90"  HorizontalContentAlignment="Right">Email:</Label>
        <TextBox Height="25" Margin="100,10,10,10" Name="txtName"  VerticalAlignment="Top" HorizontalAlignment="Left" Width="170" />
        <TextBox Height="25" Margin="365,10,10,10" Name="txtPhone"  VerticalAlignment="Top" HorizontalAlignment="Left" Width="100" />
        <TextBox Height="25" Margin="100,40,10,10" Name="txtEmail"  VerticalAlignment="Top" HorizontalAlignment="Left" Width="300" />
        <Button Height="23" Margin="100,86,0,0" Name="brnRegister"  VerticalAlignment="Top" HorizontalAlignment="Left" Width="70"  Click="brnRegister_Click">Register</Button>
        <ListView x:Name="lstUsers" Margin="10,125,10,10" Height="145"  VerticalAlignment="Top" ItemsSource="{Binding}"  HorizontalContentAlignment="Center"  SelectionChanged="lstUsers_SelectionChanged" >
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Current User" Width="480">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal">
                                    <TextBlock Text="{Binding Name}"  Width="110"/>
                                    <TextBlock Text="{Binding Phone}"  Width="70"/>
                                    <TextBlock Text="{Binding Email}"  Width="130"/>
                                    <TextBlock Text="{Binding Status}"  Width="70"/>
                                    <TextBlock Text="{Binding AcceptedBy}"  Width="100"/>
                                </StackPanel>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>
        <Label Height="37" HorizontalAlignment="Stretch" Margin="10,272,5,10"  Name="lblSelectedNotes" VerticalAlignment="Top" Visibility="Hidden" />
        <Label Height="30" Margin="10,0,0,140" Name="lblAgent"  VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="40"  HorizontalContentAlignment="Left" Visibility="Hidden">Admin Name:</Label>
        <TextBox Height="25" Margin="60,0,0,140" Name="txtAcceptedBy"  VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="190"  Visibility="Hidden" />
        <Button Height="25" Margin="270,0,0,140" Name="btnAccept"  VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="90"  Click="btnAccept_Click" Visibility="Hidden">Accept</Button>
        <Label Height="27" HorizontalAlignment="Left" Margin="10,0,0,110"  Name="lblEvent" VerticalAlignment="Bottom" Width="76">Event Log</Label>
        <ListBox Margin="12,0,5,12" Name="lstEvents" Height="100"  VerticalAlignment="Bottom" FontStretch="Condensed" FontSize="10" />
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PersistWF.UI
{
    public static class ApplicationInterface
    {
        public static AddRequest _app { get; set; }
    }
}

        public AddRequest()
        {
            InitializeComponent();
            ApplicationInterface._app = this;
        }

private void AddEvent(string szText)
        {
            lstEvents.Items.Add(szText);
        }
        public ListBox GetEventListBox()
        {
            return this.lstEvents;
        }

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;

namespace PersistWF.UI
{
    public class ListBoxTextWriter : TextWriter 
    { 
         const string textClosed = "This TextWriter must be opened before use"; 
         private Encoding _encoding; 
         private bool _isOpen = false; 
         private ListBox _listBox; 
         public ListBoxTextWriter() 
         { 
             // Get the static list box 
             _listBox = ApplicationInterface._app.GetEventListBox(); 
             if (_listBox != null) 
             _isOpen = true; 
         } 
         public ListBoxTextWriter(ListBox listBox) 
         { 
             this._listBox = listBox; 
             this._isOpen = true; 
         } 
         public override Encoding Encoding 
         { 
             get 
             { 
                if (_encoding == null) 
                { 
                    _encoding = new UnicodeEncoding(false, false); 
                } 
                return _encoding; 
             } 
         }
         public override void Close()
         {
             this.Dispose(true);
         }
         protected override void Dispose(bool disposing)
         {
             this._isOpen = false;
             base.Dispose(disposing);
         }
         public override void Write(char value)
         {
             if (!this._isOpen)
                 throw new ApplicationException(textClosed); ;
             this._listBox.Dispatcher.BeginInvoke(new Action(() => this._listBox.Items.Add(value.ToString())));
         }
         public override void Write(string value)
         {
             if (!this._isOpen)
                 throw new ApplicationException(textClosed); 
             if (value != null)
                 this._listBox.Dispatcher.BeginInvoke(new Action(() => this._listBox.Items.Add(value)));
         }
         public override void Write(char[] buffer, int index, int count)
         {
             String toAdd = "";
             if (!this._isOpen)
                 throw new ApplicationException(textClosed); ;
             if (buffer == null || index < 0 || count < 0)
                 throw new ArgumentOutOfRangeException("buffer");
             if ((buffer.Length - index) < count)
                 throw new ArgumentException("The buffer is too small");
             for (int i = 0; i < count; i++)
                 toAdd += buffer[i];
             this._listBox.Dispatcher.BeginInvoke(new Action(() => this._listBox.Items.Add(toAdd)));
         }
    }
}

public static void AddEvent(String status)
        {
            if (_app != null)
            {
                new ListBoxTextWriter(_app.GetEventListBox()).WriteLine(status);
            }
        }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;

namespace PersistWF.UI.Activities
{

    public sealed class CreateUser : CodeActivity
    {


        public InArgument<string> Name { get; set; }
        public InArgument<string> Email { get; set; }
        public InArgument<string> Phone { get; set; }
        public InArgument<string> ConnectionString { get; set; }

        public OutArgument<User> User { get; set; }

        protected override void Execute(CodeActivityContext context)
        {
            // ایجاد کاربر
            User user = new User();
            user.Email = Email.Get(context);
            user.Name = Name.Get(context);
            user.Phone = Phone.Get(context);
            user.Status = "New";
     user.WorkflowID = context.WorkflowInstanceId;
            UserDataDataContext db = new UserDataDataContext(ConnectionString.Get(context));
            db.Users.InsertOnSubmit(user);
            db.SubmitChanges();
            User.Set(context, user);
        }
    }
}

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;
using System.Workflow.ComponentModel;

namespace PersistWF.UI.Activities
{

    public sealed class WaitForAccept<T> : NativeActivity<T>
    {
        public WaitForAccept()
            :base()
        {

        }
        public string BookmarkName { get; set; }
        public OutArgument<T> Input { get; set; } 

        protected override void Execute(NativeActivityContext context)
        {
            context.CreateBookmark(BookmarkName, new BookmarkCallback(this.Continue));
        }

        private void Continue(NativeActivityContext context, Bookmark bookmark, object value)
        {
            Input.Set(context, (T)value); 
        }
        protected override bool CanInduceIdle
        {
            get
            {
                return true;
            }
        }
    }
}

using PersistWF.UI.Activities;
using System;
using System.Activities;
using System.Activities.Statements;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PersistWF.UI
{
     public sealed class UserWF : Activity
    {
        public InArgument<string> Name { get; set; }
        public InArgument<string> Email { get; set; }
        public InArgument<string> Phone { get; set; }
        public InArgument<string> ConnectionString { get; set; }
        public InArgument<TextWriter> Writer { get; set; }

        public UserWF()
        {
            Variable<User> User = new Variable<User> { Name = "User" };
            this.Implementation = () => new Sequence
            {
                DisplayName = "EnterUser",
                Variables = { User },
                Activities = { 
                     new CreateUser   //  1. ایجاد کاربر با ورود پارامتر‌های ورودی  
                    {
                        ConnectionString = new InArgument<string>(c=> ConnectionString.Get(c)),
                        Email = new InArgument<string>(c=> Email.Get(c)),
                        Name = new InArgument<string>(c=> Name.Get(c)),
                        Phone = new InArgument<string>(c=> Phone.Get(c)),
                        User = new OutArgument<User>(c=> User.Get(c))
                    },
                    new WriteLine // 2. لاگ مربوط به دخیره کاربر
                    {
                        TextWriter = new InArgument<TextWriter>(c=> Writer.Get(c)),
                        Text = new InArgument<string>(c=> string.Format("User {0} Registered and waiting for Accept", Name.Get(c) ) )
                    },
                    new InvokeMethod 
                     { 
                         TargetType = typeof(ApplicationInterface),  // 3. برای به روزرسانی لیست کاربران ثبت شده در نمایش فرم
                         MethodName = "NewUser", 
                         Parameters = 
                         { 
                            new InArgument<User>(env => User.Get(env)) 
                         } 
                     }, 
                     new WaitForAccept<User>  // 4. اینجا فرایند متوقف می‌شود و منتظر تایید مدیر می‌ماند
                     {  
                        BookmarkName = "GetAcceptes",
                        Input = new OutArgument<User>(env => User.Get(env))
                     },
                     new WriteLine // 5. لاگ مربوط به تایید شدن کاربر
                     {
                         TextWriter = new InArgument<TextWriter>(c=> Writer.Get(c)),
                         Text = new InArgument<string>(c=> string.Format("User {0} Accepter by {1}",Name.Get(c),User.Get(c).AcceptedBy))
                     }
                }

            };

        }

    }
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="UserGenerator"
            connectionString="Data Source=.;Initial Catalog=PersistWF;Integrated Security=True"
            providerName="System.Data.SqlClient" />
    </connectionStrings>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
</configuration>

private string _connectionString = "";

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            ConnectionStringsSection css = (ConnectionStringsSection)config.GetSection("connectionStrings");
            _connectionString =  css.ConnectionStrings["UserGenerator"].ConnectionString;

private InstanceStore _instanceStore;

_instanceStore = new SqlWorkflowInstanceStore(_connectionString);
            InstanceView view = _instanceStore.Execute(_instanceStore.CreateInstanceHandle(), new CreateWorkflowOwnerCommand(), TimeSpan.FromSeconds(30));
            _instanceStore.DefaultInstanceOwner = view.InstanceOwner;

private void brnRegister_Click(object sender, RoutedEventArgs e)
        {
            Dictionary<string, object> parameters = new Dictionary<string, object>();
            parameters.Add("Name", txtName.Text);
            parameters.Add("Phone", txtPhone.Text);
            parameters.Add("Email", txtEmail.Text);
            parameters.Add("ConnectionString", _connectionString);
            parameters.Add("Writer", new ListBoxTextWriter(lstEvents));
            WorkflowApplication i = new WorkflowApplication
            (new UserWF(), parameters);
            // Setup persistence 
            i.InstanceStore = _instanceStore;
            i.PersistableIdle = (waiea) => PersistableIdleAction.Unload;
            i.Run(); 
        }

public static void NewUser(User l)
        {
            if (_app != null)
                _app.AddNewUser(l);
        }

public void AddNewUser(User l)
        {
            this.lstUsers.Dispatcher.BeginInvoke(new Action(() => this.lstUsers.Items.Add(l)));
        }

private void lstUsers_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (lstUsers.SelectedIndex >= 0)
            {
                User l = (User)lstUsers.Items[lstUsers.SelectedIndex];
                lblSelectedNotes.Visibility = Visibility.Visible;
                if (l.Status == "New")
                {
                    lblAgent.Visibility = Visibility.Visible;
                    txtAcceptedBy.Visibility = Visibility.Visible;
                    btnAccept.Visibility = Visibility.Visible;
                }
                else
                {
                    lblAgent.Visibility = Visibility.Hidden;
                    txtAcceptedBy.Visibility = Visibility.Hidden;
                    btnAccept.Visibility = Visibility.Hidden;
                }
            }
            else
            {
                lblSelectedNotes.Content = "";
                lblSelectedNotes.Visibility = Visibility.Hidden;
                lblAgent.Visibility = Visibility.Hidden;
                txtAcceptedBy.Visibility = Visibility.Hidden;
                btnAccept.Visibility = Visibility.Hidden;
            } 
        }

private void btnAccept_Click(object sender, RoutedEventArgs e)
        {
            if (lstUsers.SelectedIndex >= 0) 
             { 
                 User u = (User)lstUsers.Items[lstUsers.SelectedIndex]; 
                 Guid id = u.WorkflowID.Value;
                 UserDataDataContext dc = new UserDataDataContext(_connectionString); 
                 dc.Refresh(RefreshMode.OverwriteCurrentValues, dc.Users);
                 u = dc.Users.SingleOrDefault<User>(x => x.WorkflowID == id); 
                 if (u != null) 
                 { 
                     u.AcceptedBy = txtAcceptedBy.Text; 
                     u.Status = "Assigned"; 
                     dc.SubmitChanges();
                     // Clear the input 
                     txtAcceptedBy.Text = "";
                 }
                 // Update the grid 
                 lstUsers.Items[lstUsers.SelectedIndex] = u;
                 lstUsers.Items.Refresh();
                 WorkflowApplication i = new WorkflowApplication(new UserWF());
                 i.InstanceStore = _instanceStore;
                 i.PersistableIdle = (waiea) => PersistableIdleAction.Unload;
                 i.Load(id);
                 try
                 {
                     i.ResumeBookmark("GetAcceptes", u);
                 }
                 catch (Exception e2)
                 {
                     AddEvent(e2.Message);
                 }
             } 
        }

private void LoadExistingLeads()
        {
            UserDataDataContext dc = new UserDataDataContext(_connectionString);
            dc.Refresh(RefreshMode.OverwriteCurrentValues, dc.Users);
            IEnumerable<User> q = dc.Users;
            foreach (User u in q)
            {
                AddNewUser(u);
            }
        }

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <IsPackable>false</IsPackable>
  </PropertyGroup>
    <ItemGroup>
        <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3">
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
            <PrivateAssets>all</PrivateAssets>
        </PackageReference>
        <PackageReference Include="Microsoft.CodeAnalysis.Common" Version="4.2.0" />
        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.2.0" PrivateAssets="all" />

        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
        <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
        <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
    </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="..\NotifyPropertyChangedGenerator\NotifyPropertyChangedGenerator.csproj" />
  </ItemGroup>
</Project>

internal static class SourceGeneratorTestsExtensions
{
    public static (GeneratorDriver Driver, Compilation OutputCompilation, ImmutableArray<Diagnostic> Diagnostics)
        RunGenerators(this string source, params ISourceGenerator[] generators)
    {
        var references =
            AppDomain.CurrentDomain.GetAssemblies()
                .Where(assembly => !assembly.IsDynamic)
                .Select(assembly => MetadataReference.CreateFromFile(assembly.Location))
                .Cast<MetadataReference>();

        var inputCompilation = CSharpCompilation.Create("compilation",
            new[] { CSharpSyntaxTree.ParseText(source, new CSharpParseOptions(LanguageVersion.Latest)) },
            references,
            new CSharpCompilationOptions(OutputKind.ConsoleApplication));

        GeneratorDriver driver = CSharpGeneratorDriver.Create(generators);
        driver = driver.RunGeneratorsAndUpdateCompilation(
            inputCompilation,
            out var outputCompilation,
            out var diagnostics);

        return (driver, outputCompilation, diagnostics);
    }
}

using Microsoft.VisualStudio.TestTools.UnitTesting;
using PropertyChangedGenerator = NotifyPropertyChangedGenerator.NotifyPropertyChangedGenerator;

namespace NotifyPropertyChangedGenerator.Tests;

[TestClass]
public class GeneratorTest
{
    [TestMethod]
    public void SimpleGeneratorTest()
    {
        var userSource = @"
using System;
using System.ComponentModel;
namespace NotifyPropertyChangedDemo
{
  public class Test : INotifyPropertyChanged
  {
    private int regularField;
    private int IndexBackingField;
  }
}
";
        var (driver, outputCompilation, diagnostics) =
            userSource.RunGenerators(new PropertyChangedGenerator());

        var newFile = outputCompilation.SyntaxTrees
            .Single(x => Path.GetFileName(x.FilePath).EndsWith(".Test.cs"));

        Assert.IsNotNull(newFile);
        Assert.IsTrue(newFile.FilePath.EndsWith("Test.Notify.Test.cs"));

        var generatedSource = newFile.GetText().ToString();
        Assert.IsTrue(generatedSource.Contains("namespace NotifyPropertyChangedDemo"));

        // We can now assert things about the resulting compilation:
        Assert.IsTrue(diagnostics.IsEmpty); // there were no diagnostics created by the generators
        // we have two syntax trees, the original 'user' provided one, and the one added by the generator
        Assert.IsTrue(outputCompilation.SyntaxTrees.Count() == 2);
        // verify the compilation with the added source has no diagnostics
        Assert.IsTrue(outputCompilation.GetDiagnostics().IsEmpty);
    }
}

using OpenCvSharp;
 
namespace OpenCVSharpSample02
{
  class Program
  {
   static void Main(string[] args)
   {
    var img = Cv.LoadImage(@"..\..\images\ocv02.jpg");
 
    Cv.NamedWindow("window");
    Cv.ShowImage("window", img);
 
    Cv.WaitKey();
 
    Cv.DestroyWindow("window");
 
    Cv.ReleaseImage(img);
   }
  }
}

 var img = Cv.LoadImage(@"..\..\images\ocv02.jpg", LoadMode.GrayScale);

using (var img = new IplImage(@"..\..\images\ocv02.jpg", LoadMode.Unchanged))
{
  using (var window = new CvWindow("window"))
  {
   window.Image = img;
   Cv.WaitKey();
  }
}

namespace BlazorWasm.Client.Services
{
    public interface IClientHotelRoomService
    {
        public Task<IEnumerable<HotelRoomDTO>> GetHotelRoomsAsync(DateTime checkInDate, DateTime checkOutDate);
        public Task<HotelRoomDTO> GetHotelRoomDetailsAsync(int roomId, DateTime checkInDate, DateTime checkOutDate);
    }
}

namespace BlazorWasm.Client.Services
{
    public class ClientHotelRoomService : IClientHotelRoomService
    {
        private readonly HttpClient _httpClient;

        public ClientHotelRoomService(HttpClient httpClient)
        {
            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
        }

        public Task<HotelRoomDTO> GetHotelRoomDetailsAsync(int roomId, DateTime checkInDate, DateTime checkOutDate)
        {
            throw new NotImplementedException();
        }

        public Task<IEnumerable<HotelRoomDTO>> GetHotelRoomsAsync(DateTime checkInDate, DateTime checkOutDate)
        {
            // How to url-encode query-string parameters properly
            var uri = new UriBuilderExt(new Uri(_httpClient.BaseAddress, "/api/hotelroom"))
                            .AddParameter("checkInDate", $"{checkInDate:yyyy'-'MM'-'dd}")
                            .AddParameter("checkOutDate", $"{checkOutDate:yyyy'-'MM'-'dd}")
                            .Uri;
            return _httpClient.GetFromJsonAsync<IEnumerable<HotelRoomDTO>>(uri);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Json;
using System.Threading.Tasks;
using BlazorServer.Models;
using BlazorWasm.Client.Utils;

using System;
using System.Collections.Specialized;
using System.Web;

namespace BlazorWasm.Client.Utils
{
    public class UriBuilderExt
    {
        private readonly NameValueCollection _collection;
        private readonly UriBuilder _builder;

        public UriBuilderExt(Uri uri)
        {
            _builder = new UriBuilder(uri);
            _collection = HttpUtility.ParseQueryString(string.Empty);
        }

        public UriBuilderExt AddParameter(string key, string value)
        {
            _collection.Add(key, value);
            return this;
        }

        public Uri Uri
        {
            get
            {
                _builder.Query = _collection.ToString();
                return _builder.Uri;
            }
        }
    }
}

@using BlazorWasm.Client.Services
@using BlazorServer.Models

namespace BlazorWasm.Client
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            var builder = WebAssemblyHostBuilder.CreateDefault(args);
            // ...

            builder.Services.AddScoped<IClientHotelRoomService, ClientHotelRoomService>();

            // ...
        }
    }
}

namespace BlazorWasm.WebApi.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class HotelRoomController : ControllerBase
    {
        // ...

        [HttpGet]
        public async Task<IActionResult> GetHotelRooms(DateTime? checkInDate, DateTime? checkOutDate)
        {
          // ...
        }

        [HttpGet("{roomId}")]
        public async Task<IActionResult> GetHotelRoom(int? roomId, DateTime? checkInDate, DateTime? checkOutDate)
        {
           // ...
        }
    }
}

namespace BlazorServer.Services
{
    public interface IHotelRoomService : IDisposable
    {
        Task<List<HotelRoomDTO>> GetAllHotelRoomsAsync(DateTime? checkInDate, DateTime? checkOutDate);
        Task<HotelRoomDTO> GetHotelRoomAsync(int roomId, DateTime? checkInDate, DateTime? checkOutDate);
        // ...
    }
}

{
    "BaseAPIUrl": "https://localhost:5001/"
}

namespace BlazorWasm.Client
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            var builder = WebAssemblyHostBuilder.CreateDefault(args);
            // ... 

            // builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
            builder.Services.AddScoped(sp => new HttpClient
            {
                BaseAddress = new Uri(builder.Configuration.GetValue<string>("BaseAPIUrl"))
            });

            // ... 
        }
    }
}

@page "/hotel/rooms"

@inject ILocalStorageService LocalStorage
@inject IJSRuntime JsRuntime
@inject IClientHotelRoomService HotelRoomService

<h3>HotelRooms</h3>

@code {
    HomeVM HomeModel = new HomeVM();
    IEnumerable<HotelRoomDTO> Rooms = new List<HotelRoomDTO>();

    protected override async Task OnInitializedAsync()
    {
        try
        {
            var model = await LocalStorage.GetItemAsync<HomeVM>(ConstantKeys.LocalInitialBooking);
            if (model is not null)
            {
                HomeModel = model;
            }
            else
            {
                HomeModel.NoOfNights = 1;
            }
            await LoadRooms();
        }
        catch (Exception e)
        {
            await JsRuntime.ToastrError(e.Message);
        }
    }

    private async Task LoadRooms()
    {
        Rooms = await HotelRoomService.GetHotelRoomsAsync(HomeModel.StartDate, HomeModel.EndDate);
    }
}

{
  "iisSettings": {
    "iisExpress": {
      "applicationUrl": "http://localhost:62930",
      "sslPort": 44314
    }
  }
}

{
    "BlazorWasm.Client": {
      "applicationUrl": "https://localhost:5002;http://localhost:5003",
    }  
}

using System;
using FluentValidation;
using FluentValidation.Validators;

namespace FluentValidationSample.Models
{
    public class LowerThanValidator : PropertyValidator
    {
        public string DependentProperty { get; set; }

        public LowerThanValidator(string dependentProperty) : base($"باید کمتر از {dependentProperty} باشد")
        {
            DependentProperty = dependentProperty;
        }

        protected override bool IsValid(PropertyValidatorContext context)
        {
            if (context.PropertyValue == null)
            {
                return false;
            }

            var typeInfo = context.Instance.GetType();
            var dependentPropertyValue =
                Convert.ToInt32(typeInfo.GetProperty(DependentProperty).GetValue(context.Instance, null));

            return int.Parse(context.PropertyValue.ToString()) < dependentPropertyValue;
        }
    }

    public static class CustomFluentValidationExtensions
    {
        public static IRuleBuilderOptions<T, int> LowerThan<T>(
            this IRuleBuilder<T, int> ruleBuilder, string dependentProperty)
        {
            return ruleBuilder.SetValidator(new LowerThanValidator(dependentProperty));
        }
    }
}

using FluentValidation;
using FluentValidation.AspNetCore;
using FluentValidation.Internal;
using FluentValidation.Resources;
using FluentValidation.Validators;
using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;

namespace FluentValidationSample.Models
{
    public class LowerThanClientValidator : ClientValidatorBase
    {
        private LowerThanValidator LowerThanValidator
        {
            get { return (LowerThanValidator)Validator; }
        }

        public LowerThanClientValidator(PropertyRule rule, IPropertyValidator validator) :
            base(rule, validator)
        {
        }

        public override void AddValidation(ClientModelValidationContext context)
        {
            MergeAttribute(context.Attributes, "data-val", "true");
            MergeAttribute(context.Attributes, "data-val-LowerThan", GetErrorMessage(context));
            MergeAttribute(context.Attributes, "data-val-LowerThan-dependentproperty", LowerThanValidator.DependentProperty);
        }

        private string GetErrorMessage(ClientModelValidationContext context)
        {
            var formatter = ValidatorOptions.MessageFormatterFactory().AppendPropertyName(Rule.GetDisplayName());
            string messageTemplate;
            try
            {
                messageTemplate = Validator.Options.ErrorMessageSource.GetString(null);
            }
            catch (FluentValidationMessageFormatException)
            {
                messageTemplate = ValidatorOptions.LanguageManager.GetStringForValidator<NotEmptyValidator>();
            }
            return formatter.BuildMessage(messageTemplate);
        }
    }
}

<input dir="rtl" type="number"
 data-val="true"
 data-val-lowerthan="باید کمتر از Age باشد"
 data-val-lowerthan-dependentproperty="Age"
 data-val-required="'سابقه کار' must not be empty."
 id="Experience"
 name="Experience"
 value="">

    public class UserModel
    {
        [Display(Name = "نام کاربری")]
        public string Username { get; set; }

        [Display(Name = "سن")]
        public int Age { get; set; }

        [Display(Name = "سابقه کار")]
        public int Experience { get; set; }
    }

    public class UserValidator : AbstractValidator<UserModel>
    {
        public UserValidator()
        {
            RuleFor(x => x.Username).NotNull();
            RuleFor(x => x.Age).NotNull();
            RuleFor(x => x.Experience).LowerThan(nameof(UserModel.Age)).NotNull();
        }
    }

namespace FluentValidationSample.Web
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllersWithViews().AddFluentValidation(
                fv =>
                {
                    fv.RegisterValidatorsFromAssembly(Assembly.GetExecutingAssembly());
                    fv.RegisterValidatorsFromAssemblyContaining<RegisterModelValidator>();
                    fv.RunDefaultMvcValidationAfterFluentValidationExecutes = false;

                    fv.ConfigureClientsideValidation(clientSideValidation =>
                    {
                        clientSideValidation.Add(
                            validatorType: typeof(LowerThanValidator),
                            factory: (context, rule, validator) => new LowerThanClientValidator(rule, validator));
                    });
                }
            );
        }

<script src="~/lib/jquery/dist/jquery.min.js"></script>
<script src="~/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>
<script src="~/lib/jquery-validation/dist/jquery.validate.js"></script>
<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.js"></script>
<script src="~/js/site.js" asp-append-version="true"></script>

$.validator.unobtrusive.adapters.add('LowerThan', ['dependentproperty'], function (options) {
    options.rules['LowerThan'] = {
        dependentproperty: options.params['dependentproperty']
    };
    options.messages['LowerThan'] = options.message;
});

$.validator.addMethod('LowerThan', function (value, element, parameters) {      
    var dependentProperty = '#' + parameters['dependentproperty'];
    var dependentControl = $(dependentProperty);
    if (dependentControl) {
        var targetvalue = dependentControl.val();
        if (parseInt(targetvalue) > parseInt(value)) {
            return true;
        }
        return false;
    }
    return true;
});

@using FluentValidationSample.Models
@model UserModel
@{
    ViewData["Title"] = "Home Page";
}
<div dir="rtl">
    <form asp-controller="Home"
          asp-action="RegisterUser"
          method="post">
        <fieldset class="form-group">
        <legend>ثبت نام</legend>
            <div class="form-group row">
                <label asp-for="Username" class="col-md-2 col-form-label text-md-left"></label>
                <div class="col-md-10">
                    <input dir="rtl" asp-for="Username" class="form-control" />
                    <span asp-validation-for="Username" class="text-danger"></span>
                </div>
            </div>
            <div class="form-group row">
                <label asp-for="Age" class="col-md-2 col-form-label text-md-left"></label>
                <div class="col-md-10">
                    <input dir="rtl" asp-for="Age" class="form-control" />
                    <span asp-validation-for="Age" class="text-danger"></span>
                </div>
            </div>
            <div class="form-group row">
                <label asp-for="Experience" class="col-md-2 col-form-label text-md-left"></label>
                <div class="col-md-10">
                    <input dir="rtl" asp-for="Experience" class="form-control" />
                    <span asp-validation-for="Experience" class="text-danger"></span>
                </div>
            </div>

            <div class="form-group row">
                <label class="col-md-2 col-form-label text-md-left"></label>
                <div class="col-md-10 text-md-right">
                    <button type="submit" class="btn btn-info col-md-2">ارسال</button>
                </div>
            </div>
        </fieldset>
    </form>
</div>