In VS2010 I created a new .NET 3.5 solution and inside a new project for SharePoint 2010 (empty project called "SPAppPageTest"); I deployed it as a farm solution. I added a new application page, called CustomApplicationPage1.aspx via add - new item solution explorer menu - I didn't change the page. Here's what my project layout looks like:

enter image description here

I deploy this by right-clicking the project -> Deploy. In directory C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS I can after this see a "SPAppPageTest" folder with a file "CustomApplicationPage1.aspx". However, trying to view the page in browser (Firefox or Chrome) results in "404 FILE NOT FOUND" page being displayed (in IE I get "This webpage cannot be found"). The URL I'm entering is:


What am I doing wrong?

Here's how CustomApplicationPage1.aspx looks like (I haven't changed it, it's the default code that VS generates):

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>
<%@ Import Namespace="Microsoft.SharePoint.ApplicationPages" %>
<%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<%@ Import Namespace="Microsoft.SharePoint" %>
<%@ Assembly Name="Microsoft.Web.CommandUI, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CustomApplicationPage1.aspx.cs" Inherits="SPAppPageTest.Layouts.SPAppPageTest.CustomApplicationPage1" DynamicMasterPageFile="~masterurl/default.master" %>

<asp:Content ID="PageHead" ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server">


<asp:Content ID="Main" ContentPlaceHolderID="PlaceHolderMain" runat="server">


<asp:Content ID="PageTitle" ContentPlaceHolderID="PlaceHolderPageTitle" runat="server">
Application Page

<asp:Content ID="PageTitleInTitleArea" ContentPlaceHolderID="PlaceHolderPageTitleInTitleArea" runat="server" >
My Application Page
  • 1
    Further to @RJCuthbertson's answer, what is the Site Collection URL the solution is set to deploy to? To find out, click on the SPAppPageTest project, and make sure the properties pane is showing. You want the value in "Site URL". the URL to use to access your page would then be 'http://[Site URL]/_layouts/SPAppPageTest/CustomApplicationPage1.aspx', or 'servername.domain.com/sites/Site1/_layouts/SPAppPageTest/…', for example. Because it's a layouts page, you should be able to access it from _any valid site collection URL, though.
    – Eccentropy
    Commented Feb 6, 2014 at 17:14
  • @Eccentropy exactly :) Any valid site collection will have access to any and all files in the layouts directory in the hive. Commented Feb 6, 2014 at 21:33

1 Answer 1


The first thing that comes to mind is the URL of your site. It appears everything that you've done is correct as far as the project setup and deployment.

The URL of your site needs to be a valid site collection, not just the server name, otherwise SharePoint won't handle the virtual path properly.

So instead of:


Make sure that it's:


Seems like the most likely problem.

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