Input Validation Using Flow Abort Exception

In this page we'll:

• Use the FlowAbortException to prevent the user from leaving the Controller

protected override void OnSavingRow()
{
    if (Orders.OrderDate.Year < 1990)
    {
        System.Windows.Forms.MessageBox.Show("Invalid Year");
        throw new Firefly.Box.Advanced.FlowAbortException();
    }
} 

• Use ENV.Message.ShowError to show a message and throw the exception in one line

protected override void OnSavingRow()
{
    if (Orders.OrderDate.Year < 1990)
    {
-       System.Windows.Forms.MessageBox.Show("Invalid Year");
-       throw new Firefly.Box.Advanced.FlowAbortException();
        Message.ShowError("Invalid Year");
    }
} 

• Explain how to determine if Visual Studio should switch to the code when this exception happens

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