public void btnSave_Click(object sender, EventArgs e)
 {
     int selectedUserId = this.SelectedUserId;
     User user = new User(selectedUserId);
     foreach (ListItem item in this.cblRole.Items)
     {
         int roleID = Globals.SafeInt(item.Value, -1);
         if (item.Selected)
         {
             user.AddAssignRole(selectedUserId, roleID);
         }
         else
         {
             user.DeleteAssignRole(selectedUserId, roleID);
         }
     }
 }