See if user is part of Active Directory group in C

Question

I need a way to see if a user is part of an active directory group from my .Net 3.5 asp.net c# application.

I am using the standard ldap authentication example off of msdn but I don't really see how to check against a group.

Answer 1

Brandon Johnson, loved it, I used what you had, but made the following change:

private static string[] GetGroupNames(string domainName, string userName)
{
    List<string> result = new List<string>();

    using (PrincipalContext principalContext = new PrincipalContext(ContextType.Domain, domainName))
    {
        using (PrincipalSearchResult<Principal> src = UserPrincipal.FindByIdentity(principalContext, userName).GetGroups(principalContext))
        {
            src.ToList().ForEach(sr => result.Add(sr.SamAccountName));
        }
    }

    return result.ToArray();
}