Validating in asp net

Performing validation in server code is a security measure, in case users bypass client-based validation.In this example, the test for a valid date won't work in client code.If a form is long or complex, reporting errors only after the page is submitted can be inconvenient to the user.You can add support to perform validation in client script.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.If a user enters a non-integer value, the error is reported as soon as the user leaves the entry field.

So you must check these values in order to protect your application. This test would pass the first time that the page is requested, but not when the request is a form submission.Sometimes you have to validate information that doesn't come directly from an HTML form.A typical example is a page where a value is passed in a query string, as in the following example: source, including form-field values, query-string values, and cookie values.When you restrict the values that users can enter in forms, you reduce the chance that someone can enter a value that can compromise the security of your site.To see how validation works, run this page and deliberately make mistakes.

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