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Editorial Team
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Asked: 2026-05-20T07:25:35+00:00

I’m currently rewriting a legacy SharePoint application and I need to figure out how

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I’m currently rewriting a legacy SharePoint application and I need to figure out how to deploy it.
The application itself is SharePoint solution with several features, including webparts and simple web pages with some code.

There is a webpage that is designed to be deployed in layouts subfolder.
In production environment, there is no codebehind in layouts subdirectory, just the .aspx file.

I understand that corresponding codebehind assembly is loaded from GAC. Indeed, it is there.
However the page code doesn’t contain <%@ Assembly %> directive that would ask it look in GAC, nor does it specify fully-qualified name:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="BadWolf._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
    <!-- -->
</html>

So how does this page locate its code assembly in the production environment? I need to deploy the same code to a different server but if I don’t specify <%@ Assembly %> SharePoint gives me Unknown Error, which is represented in logs as follows:

Exception Type: System.Web.HttpException
Exception Message: Could not load type 'BadWolf._Default'.

What did I miss? Is there any special config, any special setting, whatever?

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1 Answer

  1. Editorial Team

    Turned out the assembly was in SharePoint bin folder, that’s why it was loaded without specifying the fully qualified name. However removing it from GAC yielded another issue:

    Request for the permission of type ‘Microsoft.SharePoint.Security.SharePointPermission, Microsoft.SharePoint.Security, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c’ failed

    This is funny because removing the assembly from either GAC or bin folder makes it unusable (or else requiring additional configuration which I seek not), and I’m not sure which one is actually being loaded.

    I think I’ll stick with keeping assembly in GAC (to have full trust) and specifying fully qualified name.

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