Getting current login from Active Directory using C# code

Simply,

string Name = new System.Security.Principal.WindowsPrincipal(System.Security.Principal.WindowsIdentity.GetCurrent()).Identity.Name;

OR

string Name = System.Environment.UserName  

OR

string Name = Environment.GetEnvironmentVariable("USERNAME");

OR

string Name = System.Security.Principal.WindowsIdentity.GetCurrent().Name;

works 🙂