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When you used server-side validation with ASP 3.0, if something the user entered was wrong, you could repost the form and ask the user to correct the information in that particular field of the form.

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By Bill Evjen Reuters December 2003 Applies to: Microsoft® ASP. NET validation server controls that are at your disposal.

NET Summary: Learn how to use all the available ASP.

Some users are not interested in spending enough time to enter the correct information into a form, and in some cases, users might even intentionally enter false information to gain access or get past a certain step in your application's workflow process.

One of the first steps is to understand what validating data means.

Validating, in this case, does not mean that if John Doe types his name into the form field of a text box as Fred Doe the computer sends an alert to inform you that the data is untruthful.

No, we still do not have the capability to find out whether a statement is true.If the data is incorrect or not valid, you can send back a response stating this.If, however, when the user clicks the Submit button, a scripting language that is part of the overall HTML page is initiated to check the validity of the data before it is sent to the server, this is client-side validation.The bad thing about server-side validation is that it requires trips back and forth to the server.This takes a lot of resources and makes for a slower-paced form for the user.Listing 1 shows you an example of using client-side Java Script to perform form validation.

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