How to find if a user is administrator or not

This code tells you if the user who is logged in is an administrator or not.

using System.Security.Principal;

bool IsAnAdministrator ()
{
   WindowsIdentity  identity = WindowsIdentity.GetCurrent();
   WindowsPrincipal principal = new WindowsPrincipal (identity);
   return principal.IsInRole(WindowsBuiltInRole.Administrator);
}