Delete all orders
To delete all existing orders, perform the following:
    - Get the orders manager.
    Get an instance of the OrdersManager object. 
    - Get all existing orders.
    To do this call the GetOrders method of the orders manager. 
    As a result, you get a queryable collection of all created order objects.
     
    - Iterate through the orders collection.
 
    - Delete the orders
    Call the DeleteOrder method of the orders manager. 
    - Save the changes to the orders manager.
 
To delete all existing orders, use the following code sample:
All orders are deleted.