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How to: Create an Application Domain

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Note

This article is specific to .NET Framework. It doesn't apply to newer implementations of .NET, including .NET 6 and later versions.

A common language runtime host creates application domains automatically when they are needed. However, you can create your own application domains and load into them those assemblies that you want to manage personally. You can also create application domains from which you execute code.

You create a new application domain using one of the overloaded CreateDomain methods in the System.AppDomain class. You can give the application domain a name and reference it by that name.

The following example creates a new application domain, assigns it the name MyDomain, and then prints the name of the host domain and the newly created child application domain to the console.

Example

using namespace System;
using namespace System::Reflection;

ref class AppDomain1
{
public:
    static void Main()
    {
        Console::WriteLine("Creating new AppDomain.");
        AppDomain^ domain = AppDomain::CreateDomain("MyDomain");

        Console::WriteLine("Host domain: " + AppDomain::CurrentDomain->FriendlyName);
        Console::WriteLine("child domain: " + domain->FriendlyName);
    }
};

int main()
{
    AppDomain1::Main();
}

using System;
using System.Reflection;

class AppDomain1
{
    public static void Main()
    {
        Console.WriteLine("Creating new AppDomain.");
        AppDomain domain = AppDomain.CreateDomain("MyDomain");

        Console.WriteLine("Host domain: " + AppDomain.CurrentDomain.FriendlyName);
        Console.WriteLine("child domain: " + domain.FriendlyName);
    }
}

Imports System.Reflection

Class AppDomain1
    Public Shared Sub Main()
        Console.WriteLine("Creating new AppDomain.")
        Dim domain As AppDomain = AppDomain.CreateDomain("MyDomain")

        Console.WriteLine("Host domain: " + AppDomain.CurrentDomain.FriendlyName)
        Console.WriteLine("child domain: " + domain.FriendlyName)
    End Sub
End Class

See also