//**********************************************************************//
        public async Task<IActionResult> UsersInRole(string Id)
        {
            var role = await roleManager.FindByIdAsync(Id);
            var model = new RoleAndUsers(); //include users in this role

            if (role == null)
            {
                ModelState.AddModelError("", $"Role does not exist");
            }
            else
            {
                ViewBag.roleName = role.Name;
                ViewBag.roleId = role.Id;

                var usersNotInRole = new List<IdentityUser>();

                foreach (var user in userManager.Users)
                {
                    if (await userManager.IsInRoleAsync(user, role.Name))
                    {
                        model.UsersInThisRole.Add(new IdentityUser { UserName = user.UserName, Email = user.Email });
                    }
                    else
                    {
                        usersNotInRole.Add(new IdentityUser { UserName = user.UserName, Email = user.Email });
                    }
                    ViewBag.UsersNotInRole = new SelectList(usersNotInRole.OrderBy(a => a.UserName).ToList());
                }

                model.UsersInThisRole = model.UsersInThisRole.OrderBy(a => a.UserName).ToList();
            }

            return View(model);
        }
        public async Task<IActionResult> RemoveUser(RoleAndUsers model)
        {

            var role = await roleManager.FindByIdAsync(model.RoleId);
            var user = await userManager.FindByNameAsync(model.UserName);

            IdentityResult result = await userManager.RemoveFromRoleAsync(user, role.Name);
            if (result.Succeeded)
            {
                TempData["message"] = $"User: {user.UserName} removed from: '{role.Name}' ";
            }

            foreach (var error in result.Errors)
            {
                ModelState.AddModelError("", error.Description);
            }

            return RedirectToAction("UsersInRole", new { id = model.RoleId });
        }