ASP.NET Tutorial/Configuration/masterPageFile

Registering Master Pages in Web Configuration

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Apply the SimpleMaster.master Master Page to every page contained in the same folder (or subfolder) as the web configuration file. A MasterPageFile attribute in a content page takes precedence over a Master Page specified in the web configuration file. File: FolderA\Web.Config <configuration> <system.web>

 <pages masterPageFile="~/SimpleMaster.master" />

</system.web> </configuration></source>