When to use client side varidation and server side varidation in .net?

In .net or classic web application we can varidate user data either on client isde or server side. How to select which side varidate to be used? Thanks!
11/18/2005 4:50:44 PM
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Generally, I use both client and server validation. I make sure the input is in the correct format and reasonably valid on the client, then I verify the data on the server. The extent of validation also depends on the type of data that I need to validate.

Here are a few references:
Validating ASP.NET Server Controls
Introduction to Validating User Input in Web Forms
Client-Side Validation for ASP.NET Server Controls
Security Checklist: ASP.NET 2.0
Validation ASP.NET Controls

Hope this helps.

-- Erik Reitan
ASP.NET User Education
This posting is provided "AS IS" with no warranties, and confers no rights.

11/22/2005 12:10:46 AM

As a rule, always use server side validation because not all browsers support the client-side validators. (In fact, in ASP.NET 1.x, only IE and IE/Mac support it.) Offer clientside validation to improve performance by avoiding postbacks.

Please see this article on many questions users have with the Microsoft validators: http://aspalliance.com/699.

--- Peter Blum
Creator of Peter's Data Entry Suite (formerly Professional Validation And More and Peter's Date Package) and Peter's Polling Package
11/22/2005 8:53:51 PM
Never rely on client-side validation alone. Use it only as an added
convenience for users (faster feedback) but always code your
server-side scripts as if there was NO client side validation. 
11/23/2005 12:47:43 AM

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