Enabling theame in the Entire application in ASP.NET

              In addition to apply an ASP.NET theme to your ASP.NET pages using the Theme attribute within the Page directive,you can alse apply it at an application level from the Web.config file .It can set as folows;

<?xml version = "1.0" encoding = "UTF-8" ?>
<configuration>
         <system.web>
                   <pages theme = "GalexyTheme" />
         </system.web>
</configuration>
              If you specify the theme in Web.Config file,you don't need to define the theme again in the Page directive of your ASP.NET pages.This theme is applied automatically to each and every page within your application