In Web site development with ASP.NET, the master page
is a feature that enables you to define common structure and interface markup
elements for your Web site, including
headers, footers, style
definitions, or navigation bars. The master page can be shared by any of the
pages in your Web site, called the Content Page,
and removes need to duplicate code for shared elements within your Web site.
ASP.Net Tutorials: Creating a Layout Using Master Pages Just as Themes and Skins allow you to factor out style definitions from your page code and maintain them in a common file, Master Pages do the same for page layout.
Customizing and Managing Your Site's Appearance When a page that uses a master page (i.e., a content page) is requested, ASP.NET merges the content page and master page together (assuming of course that both have already been compiled).
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