public static List<MapRoomUser> RemoveMapRoomUser(this List<MapRoomUser> mapRoomUsers, MapRoomUser mapRoomUser)
 {
     mapRoomUsers.Remove(mapRoomUsers.Where(s => s.user == mapRoomUser.user).FirstOrDefault());
     return mapRoomUsers;
 }
 public static List<MapRoomUser> AddMapRoomUser(this List<MapRoomUser> mapRoomUsers, MapRoomUser mapRoomUser)
 {
     mapRoomUsers.Add(mapRoomUser);
     return mapRoomUsers;
 }