Themes are a way to define properties of pages and controls, and can be used to provide consistent look across pages. There are several different levels of applying a theme to an individual control, a page, or an application. Control Level Define a named
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Read the complete post at http://blogs.iis.net/webdevelopertips/archive/2010/01/25/tip-101-did-you-know-how-to-scope-theme.aspx