Chapter 9 - Structured Error Handling

Notice that I used a few new tricks here. VB 6 doesn't allow multiple variables to be declared As Type on the same line but VB.NET does. (With VB 6, X and Y would be Variant variables and only Z would be an Integer.) I also put two statements on the same line right after that. This doesn't change the way the program runs but it does save a little space in the program source listing. And I also used the built-in constants vbCrLf and vbTab to format the output a little bit.

Here's what the Debug Output window will display after you run the program (lines shortened to fit the web page):

~~~~~~~~~~~~~~~~~~~~~~~~~
caught exception
  System.OverflowException: Arithmetic operation
  resulted in an overflow. at
  WindowsApplication1.Form1.Button1_Click(Object sender,
  EventArgs e) in C:\WindowsApplication1\Form1.vb:line 62
~~~~~~~~~~~~~~~~~~~~~~~~~

• Structure FINALLY comes to VB Error Handling!
• Exceptions to the Book! - A typo - And a more significant 'exception'
• Microsoft's Point of View
• The Difference in Code
• The Microsoft Way - Here's the Microsoft documentation method
• About the New Tricks
• What Could Go Wrong? - A Few Things That Might Be Confusing
• About the Error Messages
• Confusion in Disk Drive Error Handler ?
• Assignment For Next Time