Chapter 9 - Structured Error Handling

Before you start trying out the code examples in the book, a couple of clarifications might help.

First, there is a typo on page 237. "Check When" should be "Catch When" in Step 4. Second, the excellent VB.NET autocompletion feature will automatically code the Try ... Catch like this (as you will see as soon as you code the keyword Try):

~~~~~~~~~~~~~~~~~~~~~~~~~
Try

Catch ex As Exception

End Try
~~~~~~~~~~~~~~~~~~~~~~~~~

The book doesn't directly mention the As Exception clause anywhere. To duplicate the code in the book, just delete As Exception from the statement and everything works. Since both As Exception and the book's choice, When Condition are optional, it wouldn't be important except for one thing. Nearly all of the Microsoft documentation emphasizes As Exception and the book's choice is barely mentioned. So, to match the coding that Microsoft recommends and documents, let's look at it now. (It seems unusual that an MS Press book would not be in line with the Microsoft documentation. Go figure.)

• 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