Public Sub ModifyOrder(selectedOrderID As String)
    Dim currentOrderModify As CQGOrderModify
    Dim orderToModify As CQGOrder
    ' Get order with GWOrderID = SelectedOrderID from internal orders collection
    Set orderToModify = CEL.InternalOrders.Item(selectedOrderID)
    If orderToModify Is Nothing Then
        Debug.Print "Order is not found in internal orders collection."
        Exit Sub
    End If
   Debug.Print "Order " & orderToModify.UEName & " was found in internal orders collection."
    'Checking order availability for modification.
    If Not orderToModify.CanBeModified Then
        Debug.Print "Selected order cannot be modified."
        Exit Sub
    End If
    Set currentOrderModify = orderToModify.PrepareModify
    'Change order quantity
    currentOrderModify.Properties(opQuantity) = 11
    orderToModify.Modify currentOrderModify
    Debug.Print "Order modification request was sent."
End Sub

public void ModifyOrder(String selectedOrderID)
{
    // Get order with GWOrderID = SelectedOrderID from internal orders collection
    CQGOrder orderToModify = cel.InternalOrders[selectedOrderID];
    if (orderToModify == null)
    {
        Console.WriteLine("Order is not found in internal orders collection.");
        return;
    }
 
    Console.WriteLine("Order {0} was found in internal orders collection.", orderToModify.UEName);
 
    //Checking order availability for modification.
    if (!orderToModify.CanBeModified)
    {
        Console.WriteLine("Selected order cannot be modified.");
        return;
    }
 
    CQGOrderModify currentOrderModify = orderToModify.PrepareModify();
 
    // Change order quantity
    currentOrderModify.Properties[eOrderProperty.opQuantity].Value = 11;
 
    orderToModify.Modify(currentOrderModify);
 
    Console.WriteLine("Order modification request was sent.");
}