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Working with instances of these classes allows the developer to provide robust error-handling solutions. NET Framework provides two general classes or exceptions that derive from the common An exception associated with the exception whose Inner Exception property you are accessing.
This is helpful when a series of exceptions are involved.
Consistent use of these techniques will help make your applications more robust and reliable.
When an application encounters an unexpected situation (such as a missing file or input parameter) or a logical error (performing a division-by-zero operation, for example), by default the application will terminate and generate an error display like the one shown in Figure 3.1. NET displays an error message and terminates the application when any error occurs.
In this chapter, we'll look at two facets of dealing with problems in . First, we'll demonstrate the programming that you can do to handle errors, allowing the user to make corrections when something goes wrong.
The Common Language Runtime (CLR) represents all errors as exceptions. The Framework class library (FCL) includes a large number of standard exception classes that encapsulate information about common errors.
A network link to a server might fail just as you're transferring data.
Or perhaps you simply didn't allow for a particular rare circumstance in your code. NET Framework offers a robust set of tools for dealing with these unexpected problems.
Each new exception can preserve the information about the previous one by storing it in this property.
In a perfect world, your code would run correctly every time.
You will first see the programming you can use to handle errors, and then you will see how to use validation techniques to prevent bad data from being entered into your application in the first place.