Regestering Master Page in Web Configuration

We can apply master page to every content in our web application, Rather than add a MasterPageFile attribute to individual content pages, you can add a configuration option to the web configuration file.

How to :
1.Create a new folder within your application.
2.Create the master page your application will be using.
3.Place all pages that will be using the master page in the folder.
4.Create a web.config file that contains a element with the masterPageFile attribute set to the name of the .master file and place it in the folder.