public ActionResult ManageTicketAssignments(List <string> userIds, List <int> ticketIds) { //if and only if at least one person is chosen, do the following: if (userIds == null || ticketIds == null) { return(RedirectToAction("ManageTicketAssignments")); } //add each SELECTED USER to each SELECTED PROJECT foreach (var userId in userIds) { foreach (var ticketId in ticketIds) { //projHelper.AddUserToProject(userId, projectId); ticketHelper.AddDevToTicket(userId, ticketId); } } return(RedirectToAction("ManageTicketAssignments")); }