public async Task <IActionResult> Create([Bind("id,Name,GroupId")] GroupMember groupMember)
        {
            if (ModelState.IsValid)
            {
                await _groupMember.CreateGroupMember(groupMember);

                return(RedirectToAction("Create", "AppUserGroupMembers", new { groupMemberId = groupMember.id }));
            }
            ViewData["GroupId"] = new SelectList(_context.Groups, "id", "Name", groupMember.GroupId);
            return(View(groupMember));
        }