Public Structure OrderInfo
    Public ProductID As Long
    Public Quantity As Integer
    Public CustomerId As Long
    Public ShipVia As ShipType

 End Structure

Public Enum ShipType
    FedEx
    UPS
    Postal

 End Enum

Public Class OrderProcessing
    Public Shared Function PlaceOrder(ByVal order As OrderInfo) As Long
        ' Start a transaction

        ' Check Inventory

        ' Retrieve customer information, check credit status

        ' Calculate price and tax

        ' Calculate shipping and total order

        ' Save Order to the database and commit transaction

        ' Send an email confirming the order

        ' Return the new order ID

    End Function

 End Class