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The regular expression is set in the Validation Expression property.

The following table summarizes the commonly used syntax constructs for regular expressions: The Custom Validator control allows writing application specific custom validation routines for both the client side and the server side validation.

The server side validation routine must be called from the control's Server Validate event handler. The basic syntax for the control is as given: The Validation Summary control does not perform any validation but shows a summary of all errors in the page.

The server side validation routine should be written in any . The summary displays the values of the Error Message property of all validation controls that failed validation.

The validation control classes are inherited from the Base Validator class hence they inherit its properties and methods.

Therefore, it would help to take a look at the properties and the methods of this base class, which are common for all the validation controls: The Regular Expression Validator allows validating the input text by matching against a pattern of a regular expression.

You will work with some controls that perform all checking automatically, requiring no code.The page will therefore contain two additional controls: a check box and a text box.As before, you will use validation to check the user's entries.However, in this case you can create client-side code that performs essentially the same check that your server-side code is performing.In the final part of the walkthrough, you will add some optional information to the reservation form.This kind of situation is handled using validation groups.To create a validation group, you should put the input controls and the validation controls into the same logical group by setting their Validation Group property.You will use a The validation you added to the Web Forms page illustrates the basic concepts of Web validation controls.An important aspect of validation is understanding how it helps you increase the security for your Web site.The client side validation is accomplished through the Client Validation Function property.The client side validation routine should be written in a scripting language, such as Java Script or VBScript, which the browser can understand.


  1. PHP Server Side Form Validation - This lesson describes how to validate HTML form inputs by using PHP server side validation technique.

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