public ActionResult RoleAddToUser(string AddUserNameToUser, string AddRoleNameToUser) { if (!string.IsNullOrEmpty(AddUserNameToUser) && !string.IsNullOrEmpty(AddRoleNameToUser)) { ApplicationUser user = _rolesRepository.GetSelectedUser(AddUserNameToUser); if (user == null) { ViewBag.RoleAddToUserMessage = "Something went wrong!"; ViewBag.Roles = _rolesRepository.GetExistingRoleNames(); return(View("Index")); } var checkUserExistingRoles = _rolesRepository.UserManger().GetRoles(user.Id); if (checkUserExistingRoles.Contains(AddRoleNameToUser) == true) { ViewBag.RoleAddToUserMessage = "This role was already assigned to this user!"; } else if (user.Roles.Count > 0) { ViewBag.RoleAddToUserMessage = "A user can only have one role!"; } else { _rolesRepository.UserManger().AddToRole(user.Id, AddRoleNameToUser); ViewBag.RoleAddToUserMessage = "Role added to the user successfully!"; } } else { ViewBag.RoleAddToUserMessage = "Role was not added to the user!"; } ViewBag.Roles = _rolesRepository.GetExistingRoleNames(); return(View("Index")); }