# \[BOOK|FB2] Data Entry and Validation with C# and VB. NET Windows Forms
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※ [**\[BOOK|FB2\] - Data Entry and Validation with C# and VB. NET Windows Forms - Link**](http://phincphyltiosass.wiki-data.ru/uu?keyword=Data+Entry+and+Validation+with+C%23+and+VB.+NET+Windows+Forms\&charset=utf-8\&source=gitbook.com6) \
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Specifying a regular expression for validation CustomValidator There will be times when specific validators are not capable of solving involved validation problems, especially where complex business rules are database access is required. For a code example that validates an email address in a , see.\
The masking language that is used by is very flexible. One to set the desired data type the control is going to validate, the second one to set whether or not to check if the end-user has entered a data value, the third one is a reference to a ErrorProvider control which shows the error message to the end-user and the fourth one is the custom error message see Listing 1.\
**Data Entry and Validation with C# and VB .NET Windows Forms** - HasChildren { if HasValidationErrors control. After a few moments of friendly banter, Karen rather unusually asks Jerry for two forms of identification—a major credit card and valid driver's license.\
What is data entry without some kind of validation? Then again, what is validation? What is data entry without some kind of validation? Then again, what is validation? Validation is the process of the receiving data via the keyboard, the Dta, voice, serial connections, and so on and making sure that the data sith the specifications you have laid out. For instance, if you are looking for a number but receive a character, your validation code would ignore that character. I wrote this book because it encompasses pretty much what most Windows programmers do on a day-to-day basis. As programmers, we all work with data. We collect it, massage it, store it, retrieve it, and present results back to the user. As a matter of fact, data entry and validation are likely such constant themes throughout your programming day that I bet you don't even realize you're doing them. Where is the fun in that? After all, there is no chance for any creativity and after a few weeks of this kind of work, life becomes dull. It seems like assembly-line programming at its worst. Nick Symmonds works for the Integrated System Solutions division of Ingersoll-Rand, developing and integrating security software. He Windkws his professional life as an electronics technician. While getting his bachelor's degree in electrical engineering from the University of Hartford, he started to gravitate toward programming. Nick has spent quite a few years programming in assembly, C, C++, and Visual Basic. Recently, he has latched onto. Nick has written several articles on programming and has three books out: Internationalization and Localization Using Microsoft. He lives with his family in the northwest hills of Connecticut and has recently become addicted to golf and road cycling. He also enjoys woodworking, hiking, and exploring the hills on his motorcycle.
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