- Open the desired web site project in Microsoft Visual Web Developer Express or Visual Studio 2005.
- From the Solution Explorer pane, right click on your project name then click Add ASP.NET Folder > Theme.
- Type a desired name for the Theme.
You will use this name to reference the theme.
- From the Solutions Explorer pane, locate and double-click the web.config file.
- From the web.config file, add the desired theme to the
element. 
Web.config Example
<?xml version="1.0"?><configuration>
<appSettings/>
<system.web>
<pages theme="mgcorp"></pages>
<compilation debug="false" />
<authentication mode="Windows" />
</system.web>
</configuration>
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