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I took a break in Chapter 7 to discuss error handling. Although it may not be thought of traditionally as part of the world of data entry, error handling is even more important than normal in this arena.
This chapter covers some of the more advanced topics of data validation. You will see the Masked Edit control that was popular in VB 6.0. You will also see how to use the regular expression capability of .NET to generate short and sweet expressions for complicated data validation. Finally, you will learn how to make your own data validation control similar to the one that comes with ASP.NET.
In the next section you'll explore the most advanced, and the most flexible, of the data validation techniques: regular expressions.
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