jameschowdary wrote:Why we need Desing pattern,
You actually don't, and it seems the current mania in untrained indian developers to think that patterns are some magic silver bullet. They are not. They are valid, and worth learning, but ASP.NET will use less patterns than most, unless you use the MVC framework, because the UI is already set in stone. Either way, if you couldn't find any links, odds are you don't know how to use google. Buy the GoF book if you want to, but don't expect patterns to be something you learn overnight, or that will magically solve all your issues.