public ActionResult AddUser(int AddUserProjectID, List<string> SelectedUnassignedUsers)
        {
            if (ModelState.IsValid)
            {
                //Instantiate the helper and find the user in the DB
                ProjectsHelper helper = new ProjectsHelper(db);
                var project = db.Projects.Find(AddUserProjectID);

                //ADD NEW USER(S)


                if(SelectedUnassignedUsers != null)
                {
                    foreach (var u in SelectedUnassignedUsers)
                    {
                        //If the user isn't assigned to this project
                        if (!helper.HasProject(u, AddUserProjectID))
                        {
                            //Add the user to the project
                            helper.AssignUser(u, AddUserProjectID);
                        }
                    }

                    db.Entry(project).State = EntityState.Modified;
                    db.SaveChanges();
                    return RedirectToAction("Index");
                }
                
            }

            return RedirectToAction("Index");
        }