<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="SomeCode.aspx.cs" Inherits="SomeCode.Code" MasterPageFile="~/_catalogs/mycustompage.master" %>

Hi,

Please make sure you actually add the master file to your project and reference from folder which contains master page.

Besides, I suggest you change master page approach. More information about it, you can refer the link below:

http://blogs.msdn.com/b/bgeoffro/archive/2009/06/22/master-pages-revisited-references-to-master-pages-in-sharepoint.aspx

Feel freely to reply if there is any update.

Thanks,

Dean Wang

Hi,

Please make sure you actually add the master file to your project and reference from folder which contains master page.

Besides, I suggest you change master page approach. More information about it, you can refer the link below:

http://blogs.msdn.com/b/bgeoffro/archive/2009/06/22/master-pages-revisited-references-to-master-pages-in-sharepoint.aspx

Feel freely to reply if there is any update.

Thanks,

Dean Wang

Hi,

>> If I add master page in my project won't it create two versions of master page?

Yes, it will.

About how to deploy a custom master page in SharePoint 2013 using Visual Studio, I suggest you refer to the link below and follow the steps in it:

http://frederik.se/how-to-deploy-a-custom-master-page-in-sharepoint-2013-using-visual-studio/

Thanks,

Dean Wang