How to find if a user is administrator or not

It's quite common to find out whether a user or application is running Admin account or not.
CodeProject already has excellent tips focusing a nice way to accomplish the same task.
Have a look at the CodeProject links.

Tips posted by John Is Your App Running As Administrator?[^] and Sam Cragg gives an excellent alternate tip to John's tip.
Sam tries to focus on how to use the application manifest file (It works only in VS2010).

<requestedexecutionlevel level="requireAdministrator" uiaccess="false" />

Alternate Tip Link: Is Your App Running As Administrator?(AlternateTip By Cragg)[^]

Reference Link: http://msdn.microsoft.com/en-us/library/bb756929.aspx[^]

In addition, I've also posted my code in another forum which focuses on the same concept.
Admin Check[^]

In addition to the above reference, you can use the given code also to find out whether the user is Admin or not. Just use System.DirectoryServices.AccountManagement:

public static bool IsAdmin()
      {
          bool isAllowed = false;
          using (PrincipalContext pc = new PrincipalContext(ContextType.Machine, null))
          {
              UserPrincipal up = UserPrincipal.Current;
              GroupPrincipal gp = GroupPrincipal.FindByIdentity(pc, "Administrators");
              if (up.IsMemberOf(gp))
                  isAllowed = true;
          }
          return isAllowed;
      }

Reference Link: MSDN-[System.DirectoryServices.AccountManagement][^]