private void ComboBox_ObjOfTransact_LostFocus(object sender, RoutedEventArgs e)
 {
     if (ComboBox_ObjOfTransact.Text != "0")
     {
         int id = 0;
         ObjectOfTransaction obj;
         int.TryParse(ComboBox_ObjOfTransact.Text, out id);
         using (var service = new DataServiceClient())
         {
             obj = service.GetObjectOfTransactionById(id);
             TextBox_TransactionAmount.Text = obj.Cost.ToString();
             ComboBox_KindOfCalc.Text = ((EnumKindOfCalculating)obj.KindOfCalculatingID).ToString();
         }
     }
 }