The UserName property provides part of the credentials associated with computer domain names, as returned by the UserDomainName property. This information is typically represented as DOMAIN\username.

This property can be used to identify the current user to the system and application for security or access purposes. It can also be used to customize a particular application for each user.

The following code example displays the user name of the person who started the current thread.

' Sample for the Environment.UserName property
Imports System

Class Sample
   Public Shared Sub Main()
      Console.WriteLine()
      '  <-- Keep this information secure! -->
      Console.WriteLine("UserName: {0}", Environment.UserName)
   End Sub 'Main
End Class

// Sample for the Environment.UserName property
using System;

class Sample
{
    public static void Main()
    {
    Console.WriteLine();
//  <-- Keep this information secure! -->
    Console.WriteLine("UserName: {0}", Environment.UserName);
    }
}

// Sample for the Environment::UserName property
using namespace System;
int main()
{
   Console::WriteLine();

   //  <-- Keep this information secure! -->
   Console::WriteLine( "UserName: {0}", Environment::UserName );
}

// Sample for the Environment.UserName property

import System.*;

class Sample
{
    public static void main(String[] args)
    {
        Console.WriteLine();
        //  <-- Keep this information secure! -->
        Console.WriteLine("UserName: {0}", Environment.get_UserName());
    } //main
} 

• EnvironmentPermission 

  for read access to the USERNAME environment variable. Associated enumeration: EnvironmentPermissionAccess..::.Read

Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Reference