i need to get a list of users in a role. but the GetUsersInRole only return one row of data, Item containing a list of the users login-name. bur i also need the id of the user. i have found this but it is not returning any members.

the GridView is just to see if there are members in the role

 protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {


                MembershipUserCollection roleUsers = new MembershipUserCollection();
                MembershipUserCollection users = Membership.GetAllUsers();

                foreach (MembershipUser user in users)
                {
                    if (Roles.IsUserInRole("AFF Instruktør"))
                    {
                        roleUsers.Add(user);
                    }
                }

                ddl_Ins1.DataSource = roleUsers;
                ddl_Ins1.DataBind();

                GridView1.DataSource = Roles.GetUsersInRole("AFF Instruktør"); 
                GridView1.DataBind();

            }
        }