public void Mark(int id,OrderStatus os)
 {
     _dataAccess.NonQuery("Update Orders SET [Status]="+((int)os).ToString()+" WHERE OrdersID="+id);
 }
 public List<Orders> GetAllOrders(OrderStatus ods)
 {
     return EntityHelper<Orders>.ConvertToList(_dataAccess.Query("SELECT * FROM Orders WHERE [Status]="+(int)ods +" ORDER BY [OrderDate] DESC"));
 }