ASP.NET Master Pages

ASP.NET 2.0 introduces a new concept known as master pages, in which a common base master file contains the common look and feel and standard behavior for all the pages in your application. Once the common content is placed in the master page, the content pages (child pages) can inherit content from the master pages apart from adding their content to the final output..........

What is Master Page in ASP.NET?

A Master page offers a template for one or more web forms. It defines placeholders for the content, which can be overridden by the content pages. The content pages contains only content. When users request the content page, ASP.NET merges the layout of the master page with the content of the content page and produce output.  

Advantages of using Master Page in ASP.NET

Master pages enables consistent and standardized layout to the website.
You can make layout changes of the site in the master page instead of making change in the pages.
It is very easy to implement.

Define Multiple Master Page.

 In ASP.NET, you can have multiple master pages each for a different purpose. You can provide users several layout options using Multiple Master Page. You can define Master Page at multiple places in the web application.

You can specify page-level using the @Page dierective.
You can specify using the Web.config.

Remember that the definition closest to the user wins that means page-level definition supersedes site-level definition.