AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
WindowsPrincipal princ = (WindowsPrincipal)System.Threading.Thread.CurrentPrincipal;
if (princ.IsInRole(WindowsBuiltInRole.Administrator))
	Console.Write("You are admin!");

Use can also check IsInRole using Attributes. This is called declarative security and is the preferred way:

[PrincipalPermissionAttribute(SecurityAction.Demand, Role=@"DOMAINNAME\Administrators")]
public sealed class OnlyAdminsCanCallMe
{
}

The security demand will throw an exception that you can catch.

>Hello UT,
> How can you tell if the currently logged in user has admin rights on the local machine? I don't need to modify I only need to read. I have some application functions that I want to disable if the user doesn't have admin over the local machine. I was also hoping to avoid attempting an admin only activity to see if it fails.
>
>My Thanks in advance,