C# – Retrieving the COM class factory for component with CLSID failed due to the following error: 80040154 Class not registered

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I have a web application which is used to send email. In this application, I am reading data from an Excel file and send email.
This is working fine in the local system, but not working after uploading on the server.

I have received the following errors

Retrieving the COM class factory for component with CLSID
{00024500-0000-0000-C000-000000000046} failed due to the following
error:

80040154 Class not registered (Exception from HRESULT: 0x80040154
(REGDB_E_CLASSNOTREG)).

How can I fix it?

Best Answer

Solution: to this badimageformatexception is setting the 'Enable32bitApplications' to 'True' in IIS Apppool properties for the right apppool.

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C# – Retrieving the COM class factory for component with CLSID {} failed due to the following error: 80040154 Class not registered

That interop.X.dll is actually a wrapper around some other, unmanaged DLL that's called something like fixengine_com.dll - you need to deploy the latter on the machine where your code is running - specifically you need to copy that DLL and all its dependencies and run regsvr32 to register it with COM. That unmanaged DLL contains the COM server - actual code that will serve your requests and the interop.X.dll is only a wrapper to route calls from your managed code into that unmanaged COM server.

Javascript loading an image on hover over a link

You have to use the method document.getElementById() to get the image object before try to manipulate it:

<body>
    <img src="yourImage.jpg" alt="Home" id="image1" onmouseover="document.getElementById('image1').src='home.jpg';" onmouseout="document.getElementById('image1').src='myImage.jpg';" /> <br />
    <a href="#" onmouseover="document.getElementById('image1').src='home.jpg';" onmouseout="document.getElementById('image1').src='yourImage.jpg';">Hoover Me!</a>
</body>

You should consider using JQuery to do this kind of stuff.

Best Answer

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C# – Retrieving the COM class factory for component with CLSID {} failed due to the following error: 80040154 Class not registered

Javascript loading an image on hover over a link

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