Use LINQ to check if user is in a group. Create an extension method. public static bool InGroup(this SPUser user, SPGroup group) { return user.Groups.Cast<SPGroup>() .Any(g => g.ID == group.ID); } ```EDIT 2011-01-22: There is a shortcoming of this method. You won't get a user which is in group through a AD group. You'll get only users and ad groups. [But there is another method to check if a user is inside an AD group](/2012/01/16/check-if-a-user-is-in-a-ou/ "See my post about how to retrieve users from AD groups with PrincipalSearcher").