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I have created and implemented the IHttpModule interface in order to use the Session_Start event in SharePoint 2010 (like global.asax in asp.net). I have added the add tag into my web.config file in the modules section (because I use integrated mode) and I have also deployed my DLL to GAC, but I get this error:

The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)

Does anyone know why this is happening?

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Please post the add tag you're adding to the web.config. I bet there's a problem with the format of the assembly reference. – James Love Jul 18 '11 at 19:15
i create a class library with vs 2010 and .net 3.5 with the strong name key file and my namespace and assembly name is "OnlineUsersHTTPModule" and my class name is "OnlineUsersModule" and i deployed the output dll to GAC and also add this tag to web.config in modules section: <add name="Test" type="OnlineUsersHTTPModule, Version=1.0.0.0, Culture=neutral, PublicKeyToken=78aac1459052cd0a" preCondition="integratedMode" /> – Jalali Shakib Jul 19 '11 at 4:27
Did you find the answer for this problem? :) I have the same problem. – Marlou Mar 15 '12 at 11:10
yes i did. the problem was in my module tag in web.config file. so i check that again and fixed it. <add name="Test" type="OnlineUsersHTTPModule, Version=1.0.0.0, Culture=neutral, PublicKeyToken=78aac1459052cd0a" preCondition="integratedMode" />. it must be the full assembly name, not just the class name. – Jalali Shakib Mar 21 '12 at 14:13
If you have found the solution, please post this as an answer so that other users can find it. Thanks. – SPDoctor♦ Apr 2 '12 at 12:16

1 Answer

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The problem was in my module tag in web.config file. so i check that again and fixed it.
it must be the full assembly name, not just the class name.
i mean in c# it could be the Assembly.FullName.

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