3 Leaf Solutions, Sean Campbell's 101 Microsoft Visual Basic .NET Applications PDF

By 3 Leaf Solutions, Sean Campbell

ISBN-10: 0735618917

ISBN-13: 9780735618916

Consultant presents observation on one hundred and one absolutely executable code samples. every one code pattern demonstrates middle good points and capabilities of visible simple .NET and the .NET Framework, explains the underlying programming techniques, and gives an entire code walkthrough. For starting and intermediate .NET builders and visible simple 6 builders. Softcover.

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You’ll notice that the stack information does include ProcException1 through ProcException4, even though the exception handler is actually several frames higher on the stack. ProcException3 and ProcException4 are located in a separate module, and if you check the Include Source Info check box, the stack trace will reveal the module name as the Declaring Type. Private Sub btnException_Click(... ") End Function Conclusion In this application you’ve seen that walking the stack lets you trace the route your code took to its current location.

Stop) Catch exp As Exception ' Will catch any error that we're not explicitly trapping. Stop) End Try End Sub Displaying a Customized Message You can take advantage of the wealth of information that the Exception object offers in its properties and methods, by creating custom messages that are formatted as you choose, including just the information you want to present. For example, the following procedure responds to an IOException by notifying the user that the file could not be opened and adding the message, source, and stack trace information provided by the Exception object: Private Sub btnCustomMessage_Click(...

By the way, there’s no magic to the name OnThreadException; you can call the procedure anything you like as long as it has the correct signature. OK, MessageBoxIcon. Click Windows Forms default. NET developer’s arsenal. Keep the following principles in mind: • You create a custom exception by defining it in its own class. ApplicationException. • Custom exceptions can be thrown and caught just like built-in exceptions. • You will usually create custom exceptions to handle violations of business rules in your application, as opposed to run-of-the-mill errors, for which there is probably an exception class already defined.

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101 Microsoft Visual Basic .NET Applications by 3 Leaf Solutions, Sean Campbell

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