public ActionResult ManageMembers(List <string> membersToRemove, List <string> membersToAdd, int projectId = 0) { Project project = _db.Projects.Find(projectId); if (project == null) { return(RedirectToAction("Index", "Projects")); } // Remove Action if (membersToRemove != null) { foreach (var email in membersToRemove) { _projectHelper.RemoveUserFromProjectByEmail(email, projectId); } } // Add Action if (membersToAdd != null) { foreach (var email in membersToAdd) { _projectHelper.AddUserToProjectByEmail(email, projectId); } } return(RedirectToAction("ManageMembers", "Projects", new { id = projectId })); }