How do I get the current username in .NET using C#?

Solution 1:

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

Solution 2:

If you are in a network of users, then the username will be different:

Environment.UserName
- Will Display format : 'Username'

rather than

System.Security.Principal.WindowsIdentity.GetCurrent().Name
- Will Display format : 'NetworkName\Username'

Choose the format you want.

Solution 3:

Try the property: Environment.UserName.

Solution 4:

The documentation for Environment.UserName seems to be a bit conflicting:

Environment.UserName Property

On the same page it says:

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

AND

displays the user name of the person who started the current thread

If you test Environment.UserName using RunAs, it will give you the RunAs user account name, not the user originally logged on to Windows.

Solution 5:

I totally second the other answers, but I would like to highlight one more method which says

String UserName = Request.LogonUserIdentity.Name;

The above method returned me the username in the format: DomainName\UserName. For example, EUROPE\UserName

Which is different from:

String UserName = Environment.UserName;

Which displayed in the format: UserName

And finally:

String UserName = System.Security.Principal.WindowsIdentity.GetCurrent().Name;

which gave: NT AUTHORITY\IUSR (while running the application on IIS server) and DomainName\UserName (while running the application on a local server).