private void orderEntry_TransactionResponse(object sender, TransactionResponseEventArgs e)
{
// Report error or newly-created OrderID
if (e.Error)
{
ErrorString = e.Errors[0];
SetState(TaskStateType.Error);
}
else
{
ErrorString = orderEntry.OrderID;
SetState(TaskStateType.Done);
}
// clear up
orderEntry.TransactionResponse -= orderEntry_TransactionResponse;
orderEntry.Dispose();
orderEntry = null;
}