How to apply “white-list” input validation to protect against XSS.

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C#

ASP.NET

Hello friend

can you tell me proper way to fix Cross Site Scripting (XSS).

Description:
XSS flaws occur whenever an application takes un-trusted data and sends it to a web
browser without proper validation and escaping. XSS allows attackers to execute scripts
in the victim‟s browser which can hijack user sessions, deface web sites, redirect the
user to malicious sites or possibly introduce worms, etc.

By using white-list i able to fixes.But i cant get a proper way.
So can you tell me how to apply

“white-list” input validation to protect against XSS.