public async Task <IActionResult> ChangeRolePost(UserAndListOfRolesViewModel model)
        {
            var gameUserDb = await _db.GameUserDb.FindAsync(model.GameUserVM.Id);

            var user = await _userManager.FindByIdAsync(model.GameUserVM.Id);   //user

            var userRole = _userManager.GetRolesAsync(user).Result;
            var role     = _roleManager.FindByNameAsync(userRole[0]).Result;

            var roleName = role.Name;

            if (role.Id == model.GameUserVM.RoleId)
            {
                return(View(new UserAndListOfRolesViewModel {
                    GameUserVM = gameUserDb, Roles = _roleManager.Roles
                }));
            }

            var result = await _userManager.RemoveFromRoleAsync(user, userRole[0]);

            if (result.Succeeded)
            {
                var newRole = _roleManager.FindByIdAsync(model.GameUserVM.RoleId).Result;
                result = await _userManager.AddToRoleAsync(user, newRole.Name);

                gameUserDb.RoleId   = newRole.Id;
                gameUserDb.RoleName = newRole.Name;

                await _db.SaveChangesAsync();
            }

            ///////////////////////////////////////////////////////////////////////////////////////////////////////Changing GameUsers properties: RoleId and RoleName - Only!
            //var userRole = _db.UserRoles.FirstOrDefaultAsync(a => a.UserId == model.GameUserVM.Id).Result;
            //userRole.RoleId = model.GameUserVM.RoleId;

            //var user = _db.GameUserDb.FirstOrDefaultAsync(a => a.Id == model.GameUserVM.Id).Result;
            //user.RoleId = model.GameUserVM.RoleId;
            //var role = _roleManager.FindByIdAsync(model.GameUserVM.RoleId).Result;
            //user.RoleName = role.Name;
            ///////////////////////////////////////////////////////////////////////////////////////////////////////End
            //await _db.SaveChangesAsync();
            return(RedirectToAction(nameof(Index)));
        }
        public async Task <IActionResult> ChangeRole(string id)
        {
            if (String.IsNullOrEmpty(id))
            {
                return(NotFound());
            }
            var user = await _db.GameUserDb.FindAsync(id);

            if (user == null)
            {
                return(NotFound());
            }
            UserAndListOfRolesViewModel model = new UserAndListOfRolesViewModel()
            {
                GameUserVM = user,
                Roles      = _roleManager.Roles,
            };

            return(View(model));
        }