Master Pages is great new enhancements in ASP.NET 2.0 and if you haven't heard or use Master Pages, then you might reconsider of using this across all your existing websites. It will save you lots of times in maintaining and editing your websites source code. In old classic ASP, we do not have this features yet. Master Pages are an easy way to provide a template that can be used by any number of ASP.NET pages in your application. In working with Master Pages, you create a master file that is the template referenced by a subpage or content page. Master Pages use .master file extension whereas content pages use .aspx file extension. With MasterPages you can achieve true separation between the markup to lay out your pages and the actual content-specific markup. This makes it easy to apply a consistent look and feel to all pages in a site and makes it a breeze to update the site-wide style.