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Environment.UserName Property

Gets the user name of the person who is currently logged on to the Windows operating system.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static string UserName { get; }

Property Value

Type: System.String
The user name of the person who is logged on to Windows.

You can use the UserName property to identify the user on the current thread, to the system and application for security or access purposes. It can also be used to customize a particular application for each user.

The UserName property wraps a call to the Windows GetUserName function. The domain account credentials for a user are formatted as the user's domain name, the '\' character, and user name. Use the UserDomainName property to obtain the user's domain name and the UserName property to obtain the user name.

If an ASP.NET application runs in a development environment, the UserName property returns the name of the current user. In a published ASP.NET application, this property returns the name of the application pool account (such as Default AppPool).

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

// 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);
    }
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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