public Repository(MobileDbContext context)
 {
     _context = context;
     _dbSet   = _context.Set <TEntity>();
 }
 // GET: Orders/Create
 public IActionResult Create()
 {
     ViewData["MobileID"] = new SelectList(_context.Mobile, "ID", "ID");
     ViewData["UserID"]   = new SelectList(_context.Set <User>(), "ID", "ID");
     return(View());
 }