Check if a user is in an AD group with C#.

This functions checks weather a user account is in an AD group or not.  It will return true if the user account is in that group and false if not.

public static bool verifygroup(string s)

{

AppDomain myDomain = Thread.GetDomain();

myDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);

WindowsPrincipal group = (WindowsPrincipal)Thread.CurrentPrincipal;

     if (group.IsInRole(s) == true)

     {

          return true;

     }

     else

     {

     return false;

     }

}

if(verifygroup("mydomain\\<ad group>") == true)

{

     do something here..

}