Apply CSS style to asp.net application

Well, looks like you have done it in the opposite way: people don't make applications for a stylesheet, one makes stylesheet for an application. If you payed for a skin package, without supplying your classes to the designer, you probably wasted your money. Actually you can make your application use a stylesheet not designed for you, but it wont be easy. You need at least a sample page that is built with it, than use IE Developer tools for example to discover how the page is built and how the classes are applied. Than, you have to redesign your application to use the same layout, and same class names as the skin you have bought. You will need to use the CssClass[^] property to specify the class names. View also this tutorial: http://www.asp.net/web-forms/videos/building-20-applications/lesson-6-working-with-stylesheets-and-master-pages[^]