// GET: Room/Admin
        public async Task <IActionResult> Admin()
        {
            var rm = new RoomModel()
            {
                RoomId = GenRandomstring((int)DateTime.Now.Ticks), RoomKey = Guid.NewGuid().ToString()
            };

            _context.Add(rm);
            await _context.SaveChangesAsync();

            ViewData["roomid"]   = rm.RoomId;
            ViewData["adminkey"] = rm.RoomKey;

            return(View(rm));
        }