WindowsIdentity.Name
using System; using System.Security.Principal; class MainClass { public static void Main() { WindowsIdentity wi = WindowsIdentity.GetCurrent(); Console.WriteLine("Identity information:"); Console.WriteLine(" Authentication Type: {0}",wi.AuthenticationType); Console.WriteLine(" Is Anonymous: {0}", wi.IsAnonymous); Console.WriteLine(" Is Authenticated: {0}", wi.IsAuthenticated); Console.WriteLine(" Is Guest: {0}", wi.IsGuest); Console.WriteLine(" Is System: {0}", wi.IsSystem); Console.WriteLine(" Name: {0}", wi.Name); Console.WriteLine(" Token: {0}", wi.Token); } }