These tutorials demonstrate selected features in ASP.NET version 2.0, but they are compatible with later versions of ASP.NET as well. For the current documentation, see the ASP.NET portal on the MSDN Web site.

ASP.NET Quickstart Tutorials

Validation Controls

RequiredFieldValidator

RangeValidator

RegularExpressionValidator

CompareValidator

CustomValidator

ValidationSummary

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RequiredFieldValidator

The RequiredFieldValidator control ensures that the user does not skip an entry. The control fails validation if the value it contains does not change from its initial value when validation is performed. If all the fields in the page are valid, the page is valid.

The following sample illustrates using the RequiredFieldValidator control.

VB ReqFieldValidator1.aspx

For a detailed discussion of Web Forms validation, please see the Validating Form Input Controls section of this QuickStart tutorial.