private enum VisiteType
        {
            FirstVisite = 2,
            Reviste = 4,
        }

public virtual async Task<Maybe<TModel>> GetByIdAsync(long id)
{
    Guard.ArgumentInRange(id, 1, long.MaxValue, nameof(id));

    var entity = await UnTrackedEntitySet.Where(a => a.Id == id)
        .ProjectTo<TModel>(_mapper.ConfigurationProvider).SingleOrDefaultAsync();

    return entity;
}

Maybe<T> = Nullable<T>

using (var webClient = new WebClient())
{
    webClient.Headers.Add("user-agent", "DNTProfiler");
    var jsonData = webClient.DownloadString(url);
    var gitHubProjectReleases = JsonConvert.DeserializeObject<GitHubProjectRelease[]>(jsonData);

    foreach (var release in gitHubProjectReleases)
    {
       foreach (var asset in release.Assets)
       {
           // …
       }
    }
}

@{
    ViewBag.Title = "Index";
}
<h2>
    Index</h2>
@using (Html.BeginForm())
{
    <input type='checkbox' name='Result' value='value1' />
    <input type='checkbox' name='Result' value='value2' />
    <input type='checkbox' name='Result' value='value3' />
    <input type="submit" value="submit" />
}

using System.Web.Mvc;

namespace MvcApplication21.Controllers
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public ActionResult Index(string[] result)
        {
            return View();
        }
    }
}

@helper CheckBoxList(string name, List<System.Web.Mvc.SelectListItem> items)
    {
    <div class="checkboxList">
        @foreach (var item in items)
        {
            @item.Text
            <input type="checkbox" name="@name"
                   value="@item.Value"
                   @if (item.Selected) { <text>checked="checked"</text> }
               />
            < br />
        }
    </div>
}

using System.Collections.Generic;
using System.Web.Mvc;

namespace MvcApplication21.Controllers
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            ViewBag.Tags = new List<SelectListItem>
            {
                new SelectListItem { Text = "Item1", Value = "Val1", Selected = false },
                new SelectListItem { Text = "Item2", Value = "Val2", Selected = false },
                new SelectListItem { Text = "Item3", Value = "Val3", Selected = true }
            };
            return View();
        }

        [HttpPost]
        public ActionResult GetTags(string[] tags)
        {
            return View();
        }

        [HttpPost]
        public ActionResult Index(string[] result)
        {
            return View();
        }
    }
}

@{
    ViewBag.Title = "Index";
}
<h2>
    Index</h2>
@using (Html.BeginForm())
{
    
    <input type='checkbox' name='Result' value='value1' />
    <input type='checkbox' name='Result' value='value2' />
    <input type='checkbox' name='Result' value='value3' />
    <input type="submit" value="submit" />
}

@using (Html.BeginForm(actionName: "GetTags", controllerName: "Home"))
{
    @Helpers.CheckBoxList("Tags", (List<SelectListItem>)ViewBag.Tags)    
    <input type="submit" value="submit" />
}

using System;
using System.Collections.Generic;

namespace EF_Sample03.Models
{
    public class User
    {
        public int Id { set; get; }
        public DateTime AddDate { set; get; }
        public string Name { set; get; }
        public string LastName { set; get; }

        public string FullName
        {
            get { return Name + " " + LastName; }
        }

        public string Email { set; get; }
        public string Description { set; get; }
        public byte[] Photo { set; get; }
        public IList<Project> Projects { set; get; }
        public byte[] RowVersion { set; get; }
        public InterestComponent Interests { set; get; }

        public User()
        {
            Interests = new InterestComponent();
        }
    }
}

using System;

namespace EF_Sample03.Models
{
    public class Project
    {
        public int Id { set; get; }
        public DateTime AddDate { set; get; }               
        public string Title { set; get; }
        public string Description { set; get; }
        public virtual User User { set; get; }
        public byte[] RowVesrion { set; get; }
    }
}

namespace EF_Sample03.Models
{
    public class InterestComponent
    {
        public string Interest1 { get; set; }
        public string Interest2 { get; set; }
    }
}

using System.Data.Entity.ModelConfiguration;
using EF_Sample03.Models;

namespace EF_Sample03.Mappings
{
    public class InterestComponentConfig : ComplexTypeConfiguration<InterestComponent>
    {
        public InterestComponentConfig()
        {            
            this.Property(x => x.Interest1).HasMaxLength(450);
            this.Property(x => x.Interest2).HasMaxLength(450);
        }
    }
}

using System.Data.Entity.ModelConfiguration;
using EF_Sample03.Models;

namespace EF_Sample03.Mappings
{
    public class ProjectConfig : EntityTypeConfiguration<Project>
    {
        public ProjectConfig()
        {
            this.Property(x => x.Description).IsMaxLength();
            this.Property(x => x.RowVesrion).IsRowVersion();            
        }
    }
}

using System.Data.Entity.ModelConfiguration;
using EF_Sample03.Models;
using System.ComponentModel.DataAnnotations;

namespace EF_Sample03.Mappings
{
    public class UserConfig : EntityTypeConfiguration<User>
    {
        public UserConfig()
        {
            this.HasKey(x => x.Id);
            this.Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
            this.ToTable("tblUser", schemaName: "guest");
            this.Property(p => p.AddDate).HasColumnName("CreateDate").HasColumnType("date").IsRequired();
            this.Property(x => x.Name).HasMaxLength(450);
            this.Property(x => x.LastName).IsMaxLength().IsConcurrencyToken();
            this.Property(x => x.Email).IsFixedLength().HasMaxLength(255); //nchar(128)
            this.Property(x => x.Photo).IsOptional();
            this.Property(x => x.RowVersion).IsRowVersion();
            this.Ignore(x => x.FullName);
        }
    }
}

using System.Data.Entity;
using System.Data.Entity.Migrations;
using EF_Sample03.Mappings;
using EF_Sample03.Models;

namespace EF_Sample03.DataLayer
{
    public class Sample03Context : DbContext
    {
        public DbSet<User> Users { set; get; }
        public DbSet<Project> Projects { set; get; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new InterestComponentConfig());
            modelBuilder.Configurations.Add(new ProjectConfig());
            modelBuilder.Configurations.Add(new UserConfig());

            //modelBuilder.ComplexType<InterestComponent>();
            //modelBuilder.Ignore<InterestComponent>(); 

            base.OnModelCreating(modelBuilder);
        }
    }

    public class Configuration : DbMigrationsConfiguration<Sample03Context>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = true;
            AutomaticMigrationDataLossAllowed = true;
        }

        protected override void Seed(Sample03Context context)
        {
            base.Seed(context);
        }
    }
}

using System;
using System.Data.Entity;
using EF_Sample03.DataLayer;

namespace EF_Sample03
{
    class Program
    {
        static void Main(string[] args)
        {
            Database.SetInitializer(new MigrateDatabaseToLatestVersion<Sample03Context, Configuration>());

            using (var db = new Sample03Context())
            {
                var project1 = db.Projects.Find(1);
                if (project1 != null)
                {
                    Console.WriteLine(project1.Title);
                }
            } 
        }
    }
}

<connectionStrings>
    <clear/>
    <add
       name="Sample03Context"
       connectionString="Data Source=(local);Initial Catalog=testdb2012;Integrated Security = true"
       providerName="System.Data.SqlClient"
      />
/connectionStrings>

using System;
using SimpleCqrs.Domain;

namespace CqrsPattern.Cqrs.Command
{
    public class Account : AggregateRoot
    {
        public Account(Guid id)
        {
            Apply(new AccountCreatedEvent { AggregateRootId = id });
        }

        public void SetName(string firstName, string lastName)
        {
            Apply(new AccountNameSetEvent { FirstName = firstName, LastName = lastName });
        }

        public void OnAccountCreated(AccountCreatedEvent evt)
        {
            Id = evt.AggregateRootId;
        }
    }
}

using SimpleCqrs.Commanding;

namespace CqrsPattern.Cqrs.Command
{
    public class CreateAccountCommand : ICommand
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }
}

using System;
using SimpleCqrs.Commanding;
using SimpleCqrs.Domain;

namespace CqrsPattern.Cqrs.Command
{
    public class CreateAccountCommandHandler : CommandHandler<CreateAccountCommand>
    {
        private readonly IDomainRepository repository;

        public CreateAccountCommandHandler(IDomainRepository repository)
        {
            this.repository = repository;
        }

        public override void Handle(CreateAccountCommand command)
        {
            var account = new Account(Guid.NewGuid());
            account.SetName(command.FirstName, command.LastName);

            repository.Save(account);
        }
    }
}

using System.Linq;
using SimpleCqrs.Eventing;
using CqrsPattern.Cqrs.Db;

namespace CqrsPattern.Cqrs.Command
{
    public class AccountEventHandler : IHandleDomainEvents<AccountCreatedEvent>,
                                             IHandleDomainEvents<AccountNameSetEvent>
    {
        private readonly FakeAccountTable accountTable;

        public AccountEventHandler(FakeAccountTable accountTable)
        {
            this.accountTable = accountTable;
        }

        public void Handle(AccountCreatedEvent domainEvent)
        {
            accountTable.Add(new FakeAccountTableRow { Id = domainEvent.AggregateRootId });
        }

        public void Handle(AccountNameSetEvent domainEvent)
        {
            var account = accountTable.Single(x => x.Id == domainEvent.AggregateRootId);
            account.Name = domainEvent.FirstName + " " + domainEvent.LastName;
        }
    }
}

using System;
using SimpleCqrs.Commanding;
using CqrsPattern.Cqrs.Query;
using CqrsPattern.Cqrs.Command;

namespace CqrsPattern
{
    class Program
    {
        static void Main(string[] args)
        {
            var runtime = new SampleRunTime();

            runtime.Start();

            var fakeAccountTable = new FakeAccountTable();
            runtime.ServiceLocator.Register(fakeAccountTable);
            runtime.ServiceLocator.Register(new AccountReportReadService(fakeAccountTable));
            var commandBus = runtime.ServiceLocator.Resolve<ICommandBus>();

            var cmd = new CreateAccountCommand { FirstName = "Ali", LastName = "Kh" };

            commandBus.Send(cmd);

            var accountReportReadModel = runtime.ServiceLocator.Resolve<AccountReportReadService>();

            Console.WriteLine("Accounts in database");
            Console.WriteLine("####################");
            foreach (var account in accountReportReadModel.GetAccounts())
            {
                Console.WriteLine(" Id: {0} Name: {1}", account.Id, account.Name);
            }

            runtime.Shutdown();

            Console.ReadLine();
        }
    }
}

using System;
using System.Text.RegularExpressions;

namespace RegexLoop
{
    class Program
    {
        static void Main(string[] args)
        {
            var emailAddressRegex = new Regex(@"^[A-Za-z0-9]([_\.\-]?[A-Za-z0-9]+)*\@[A-Za-z0-9]([_\.\-]?[A-Za-z0-9]+)*\.[A-Za-z0-9]([_\.\-]?[A-Za-z0-9]+)*$|^$");
            if (emailAddressRegex.IsMatch("an.infinite.loop.sample.just_for.test"))
            {
                Console.WriteLine("Matched!");
            }

            var input = "The quick brown fox jumps";
            var pattern = @"([a-z ]+)*!";
            if (Regex.IsMatch(input, pattern))
            {
                Console.WriteLine("Matched!");
            }
        }
    }
}

using System;
using System.Text.RegularExpressions;
using System.Threading;

namespace RegexLoop
{
    public static class TimedRunner
    {
        public static R RunWithTimeout<R>(Func<R> proc, TimeSpan duration)
        {
            using (var waitHandle = new AutoResetEvent(false))
            {
                var ret = default(R);
                var thread = new Thread(() =>
                {
                    ret = proc();
                    waitHandle.Set();
                }) { IsBackground = true };
                thread.Start();

                bool timedOut = !waitHandle.WaitOne(duration, false);
                waitHandle.Close();

                if (timedOut)
                {
                    try
                    {
                        thread.Abort();
                    }
                    catch { }
                    return default(R);
                }
                return ret;
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var emailAddressRegex = new Regex(@"^[A-Za-z0-9]([_\.\-]?[A-Za-z0-9]+)*\@[A-Za-z0-9]([_\.\-]?[A-Za-z0-9]+)*\.[A-Za-z0-9]([_\.\-]?[A-Za-z0-9]+)*$|^$");
            if (TimedRunner.RunWithTimeout(
                 () => emailAddressRegex.IsMatch("an.infinite.loop.sample.just_for.test"),
                 TimeSpan.FromSeconds(2)))
            {
                Console.WriteLine("Matched!");
            }

            var input = "The quick brown fox jumps";
            var pattern = @"([a-z ]+)*!";
            if (TimedRunner.RunWithTimeout(() => Regex.IsMatch(input, pattern), TimeSpan.FromSeconds(2)))
            {
                Console.WriteLine("Matched!");
            }
        }
    }
}