How you apply a theme in whole application in .Net?

by setting theme value in web.config Page Tag

We can use themes and skins in .Net applications. We can have more than one themes for the application, Ultimately the default themes will effect for the first time. You can change it later on as your wish. http://msdn.microsoft.com/en-us/library/ykzx33wh.aspx Thanks, Loganathan