How does an AppDomain get created?

AppDomains are usually created by hosts. Examples of hosts are the Windows Shell, ASP.NET and IE. When you run a .NET application from the command-line, the host is the Shell. The Shell creates a new AppDomain for every application. AppDomains can also be explicitly created by .NET applications. Here is a C# sample which creates an AppDomain, creates an instance of an object inside it, and then executes one of the object's methods:

using System;

using System.Runtime.Remoting;

using System.Reflection;

public class CAppDomainInfo : MarshalByRefObject


public string GetName() { return AppDomain.CurrentDomain.FriendlyName; }


public class App


public static int Main()


AppDomain ad = AppDomain.CreateDomain( "Andy's new domain" );

CAppDomainInfo adInfo = (CAppDomainInfo)ad.CreateInstanceAndUnwrap(

Assembly.GetCallingAssembly().GetName().Name, "CAppDomainInfo" );

Console.WriteLine( "Created AppDomain name = " + adInfo.GetName() );

return 0;