.NET 5 Preview 7 is now available and is ready for evaluation. Here’s what’s new in this release:

• Blazor WebAssembly apps now target .NET 5
• Updated debugging requirements for Blazor WebAssembly
• Blazor accessibility improvements
• Blazor performance improvements
• Certificate authentication performance improvements
• Sending HTTP/2 PING frames
• Support for additional endpoints types in the Kestrel sockets transport
• Custom header decoding in Kestrel
• Other minor improvements 

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Data.Entity.ModelConfiguration;

namespace EF_General.Models.Ex18
{
    public class UserProfile
    {
        public int UserProfileId { set; get; }
        public string UserName { set; get; }

        [ForeignKey("CartableId")]
        public virtual Cartable Cartable { set; get; } // one-to-zero-or-one
        public int? CartableId { set; get; }

        public virtual ICollection<Doc> Docs { set; get; } // one-to-many
    }

    public class Doc
    {
        public int DocId { set; get; }
        public string Title { set; get; }
        public string Body { set; get; }

        [ForeignKey("UserProfileId")]
        public virtual UserProfile UserProfile { set; get; }
        public int UserProfileId { set; get; }

        public virtual ICollection<Cartable> Cartables { set; get; } // many-to-many
    }

    public class Cartable
    {
        public int CartableId { set; get; }

        [ForeignKey("UserProfileId")]
        public virtual UserProfile UserProfile { set; get; }
        public int UserProfileId { set; get; }

        public virtual ICollection<Doc> Docs { set; get; } // many-to-many
    }

    public class UserProfileMap : EntityTypeConfiguration<UserProfile>
    {
        public UserProfileMap()
        {
            this.HasOptional(x => x.Cartable)
                .WithRequired(x => x.UserProfile)
                .WillCascadeOnDelete();
        }
    }

    public class MyContext : DbContext
    {
        public DbSet<UserProfile> UserProfiles { get; set; }
        public DbSet<Doc> Docs { get; set; }
        public DbSet<Cartable> Cartables { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new UserProfileMap());
            base.OnModelCreating(modelBuilder);
        }
    }

    public class Configuration : DbMigrationsConfiguration<MyContext>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = true;
            AutomaticMigrationDataLossAllowed = true;
        }
    }

    public static class Test
    {
        public static void RunTests()
        {
            Database.SetInitializer(new MigrateDatabaseToLatestVersion<MyContext, Configuration>());
            using (var context = new MyContext())
            {
                var user = context.UserProfiles.Find(1);
                if (user != null)
                    Console.WriteLine(user.UserName);
            }
        }
    }
}

Introducing FOREIGN KEY constraint 'FK_DocCartables_Cartables_Cartable_CartableId' 
on table 'DocCartables' may cause cycles or multiple cascade paths. Specify 
ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
Could not create constraint. See previous errors.

public int? UserProfileId { set; get; }

The referential relationship will result in a cyclical reference that is not allowed. [ Constraint name =  ]

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();
  }
}

using Quartz;
using System.Data;
using System.Data.OleDb;
using System.Configuration;


namespace WebApplication1
{
    
    public class TestQuartzClass:IJob
    {
        
       
        public void Execute(IJobExecutionContext context)
        {
            //Page myPage = (Page)HttpContext.Current.Handler;
            //TextBox MyTextBox=(TextBox)myPage.FindControl("txt");
            
            string sql = "Insert into tbl_Test (Content) values (@Content)";
            ExecuteNoneQuery(System.Data.CommandType.Text, sql, new OleDbParameter[]{
                //new OleDbParameter("@Content", MyTextBox.Text)
                new OleDbParameter("@Content","Hello world!")
            });

        }

        public int ExecuteNoneQuery(CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
        {
            using (OleDbConnection con = new OleDbConnection(ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString))
            {
                OleDbCommand cmd = new OleDbCommand();
                cmd.Connection = con;
                cmd.CommandType = commandType;
                cmd.CommandText = commandText;
                cmd.Parameters.AddRange(commandParameters);
                con.Open();
                int retVal = cmd.ExecuteNonQuery();
                con.Close();
                return retVal;
            }
        }
    }


}

using System;
using Quartz;
using Quartz.Impl;

namespace WebApplication1
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        public static void ConfigureQuartzJobs()
        {
            // construct a scheduler factory
            ISchedulerFactory schedFact = new StdSchedulerFactory();

            // get a scheduler
            IScheduler sched = schedFact.GetScheduler();
            sched.Start();
            IJobDetail job = JobBuilder.Create<TestQuartzClass>()
                .WithIdentity("SendJob")
                .Build();
            var trigger = TriggerBuilder.Create()
                .WithIdentity("SendTrigger")
                .WithSimpleSchedule(x => x.WithIntervalInMinutes(1).RepeatForever())
                //.StartAt(startTime)
                .StartNow()
                .Build();

            sched.ScheduleJob(job, trigger);
        }

        protected void btn_Click(object sender, EventArgs e)
        {
            ConfigureQuartzJobs();
        }
    }
}

new OleDbParameter("@Content","Hello world!")

Page myPage = (Page)HttpContext.Current.Handler;
            TextBox MyTextBox=(TextBox)myPage.FindControl("txt");

new OleDbParameter("@Content", MyTextBox.Text)

namespace MergeAssembliesIntoWPF.ViewModels
{
    public class ViewModel1
    {
        public string Data { set; get; }

        public ViewModel1()
        {
            Data = "Test";
        }
    }
}

<UserControl x:Class="MergeAssembliesIntoWPF.Shell.View1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             xmlns:VM="clr-namespace:MergeAssembliesIntoWPF.ViewModels;assembly=MergeAssembliesIntoWPF.ViewModels"
             d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.Resources>
        <VM:ViewModel1 x:Key="ViewModel1" />
    </UserControl.Resources>
    <Grid DataContext="{Binding Source={StaticResource ViewModel1}}">
        <TextBlock Text="{Binding Data}" />
    </Grid>
</UserControl>

<Window x:Class="MergeAssembliesIntoWPF.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:V="clr-namespace:MergeAssembliesIntoWPF.Shell;assembly=MergeAssembliesIntoWPF.Shell"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <V:View1 x:Key="View1" />
    </Window.Resources>
    <Grid>
        <V:View1 />
    </Grid>
</Window>

 <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

  <Target Name="AfterResolveReferences">
    <ItemGroup>
      <EmbeddedResource Include="@(ReferenceCopyLocalPaths)" Condition="'%(ReferenceCopyLocalPaths.Extension)' == '.dll'">
        <LogicalName>%(ReferenceCopyLocalPaths.DestinationSubDirectory)%(ReferenceCopyLocalPaths.Filename)%(ReferenceCopyLocalPaths.Extension)</LogicalName>
      </EmbeddedResource>
    </ItemGroup>
  </Target>

using System;
using System.Globalization;
using System.Reflection;

namespace MergeAssembliesIntoWPF
{
    public class Program
    {
        [STAThreadAttribute]
        public static void Main()
        {
            AppDomain.CurrentDomain.AssemblyResolve += OnResolveAssembly;
            App.Main();
        }

        private static Assembly OnResolveAssembly(object sender, ResolveEventArgs args)
        {
            var executingAssembly = Assembly.GetExecutingAssembly();
            var assemblyName = new AssemblyName(args.Name);

            var path = assemblyName.Name + ".dll";
            if (assemblyName.CultureInfo.Equals(CultureInfo.InvariantCulture) == false)
            {
                path = String.Format(@"{0}\{1}", assemblyName.CultureInfo, path);
            }

            using (var stream = executingAssembly.GetManifestResourceStream(path))
            {
                if (stream == null)
                    return null;

                var assemblyRawBytes = new byte[stream.Length];
                stream.Read(assemblyRawBytes, 0, assemblyRawBytes.Length);
                return Assembly.Load(assemblyRawBytes);
            }
        }
    }
}