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Our objective with validation is as follows: We visited a large number of real pages to determine the sort of scenarios these components needed to be able to handle.

NET and walks through an example of adding validation to a page.(11 printed pages) Introduction The Problem The Objective The Solution-Overview Client Features What Is a Validator?Validator Walk-Through It's Not Voluntary Getting Regular Comparing Apples and Apples Custom Fit The Finale Sample Code Validating user input is a common scenario in a Web-based application.For production applications, developers often end up spending a lot more time and code on this task than we would like. NET page framework, it was important to try and make the task of validating input a lot easer than it has been in the past.In HTML 3.2, validating data is a difficult process.

Each time you get a request, you need to write code to check the input and write any errors the user has made back to the page to help the user to correctly fill in the form.This is a taxing process for end users, developers, and servers alike.DTHML and scripting languages improve things somewhat.It is possible to provide the user with immediate feedback on bad input and to prevent them from posting a page until it has been corrected.However, it can be almost impossible to guarantee that every user of your site has the required scripting environment.This usually means that if you want to use script to improve the interface of your pages, you have to write the same validation logic twice, once on the client, and again on the server, just in case the client script cannot be executed.