What is Client and server side validation in ASP .net? How can it can be performed?

Answer 1

Name it self indicates whete client side validation and server side validation. Client side validation is written Java script or DHTML. You may not always rely on that becuase user may disable the java script in his browser.


http://samples.gotdotnet.com/quickstart/aspplus/doc/webvalidation.aspx#client

Server side validation is done on the server hence needs a postback to the server. Asp.net has lot validation controls Please see the examples below

http://samples.gotdotnet.com/quickstart/aspplus/doc/webvalidation.aspx#client

Answer 2

For Client Validation,
u have to use JAVA Script or VB Script.
Server Side Validation use ASP.Net

Client Validation can be performed by using Validation Controls available in ASP.Net like REgular Expression validator etc ....
or u can write code to check it.
Examples are check for blank data, compare passwords, compare age and dob, check email address, pincode, passport number length, credit card length etc..

Server Side validation is like Checking whether user account exists or not, VALID passsport, VALID Credit Card etc....