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This code would certainly work, but it requires extra variables and the programmer must check for errors every time a bitmap is created. This might be problematic if the programmer forgets or a new error is added which is not handled by the code. Then our design is for naught and bad things will happen. In critical production code, the mishandling of errors can lead to serious problems such as corrupted database information, unexpected stock trades, or other actions that a user or a program would not normally allow to happen. So this solution does not provide the best guarantees for program and data stability. A second way to handle errors is to provide a global GetLastError function. This solution was used by Microsoft prior to the MFC environment, and is still used in some cases within MFC. It looks something like this:

If you visit a lot of publishers web sites, you ll have seen sign-up pages for external beta testers External beta testing takes two forms: open, meaning that anyone is allowed to download and play the game; and closed, meaning that the company chooses a specific group of people from a pool of applicants Open beta testing allows the company to try the game on a wide range of hardware configurations, but since they don t have any control over who signs up, the quality of the bug reports tends to be rather uneven With closed beta testing, the company hopes to find people who are serious and dedicated to helping them make a better game Beta testing is a great way to get to know someone inside a game company: the testing manager Try to get accepted for closed betas if you can: instead of being one name out of hundreds participating, you ll be one name out of 40 or 50 One of the advantages of beta testing is that you don t have to live near the company to do it Here s what you need to be a beta tester: A good PC Unless they re making products for children, most publishers design their games for a fairly high-end PC If your graphics hardware is more than two years old, or your CPU runs at less than half the speed of the current top-of-the-line product, it s probably too slow to run the latest games A decent Internet connection A 56K modem is the absolute minimum; a cable modem or ADSL connection is much preferable Many beta tests require that you download huge files, 100MB and more If you re testing an online game, you may also be at a significant gameplay disadvantage with a slower connection Time In order to be of real use as a beta tester, you have to be willing to devote some time to it several hours a week For online testing, you may.

// Wrong way #2 to support error handler Bitmap bm = new Bitmap(dlg.OpenFile()); int err = GetLastError(); if (err != 0) { // Handle error values much like the above code }

This is more elegant than the previous method, but has all the same problems. Programmers may forget to use it, and error codes change from release to release. Exceptions provide a solution to these problems by forcing a programmer to deal with them, and provide guarantees that the program will exit if they do not. When an exception is not caught by a program, the program will exit. A forced exit is much safer than continuing to run in an error state and risk compromising critical data. More formally, an exception is an unexpected error, or exceptional condition, that may occur in a program. Code that creates such a condition is said to throw the exception, and code that processes the condition is said to catch the exception. In .NET,

exceptions are implemented as classes. Almost all exceptions inherit from the System.Exception class.