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Editorial Team
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Asked: 2026-06-14T03:32:03+00:00

I have 2 projects, The first project C# project where I have a blank

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I have 2 projects,

The first project C# project where I have a blank form(new project).
I am compiling this form as a dll so I can reference the form.

The VB project is an ExcelDNA project which consists of a custom task pane with a button to open the form,the task pane works fine.
However, I get the following error when clicking the Button:

System.IO.FileNotFoundException: Could not load file or assembly

I can get this to work by creating a UserControl in the VB project, and then accessing it via the Button, however I have the form written in C# already and do not want to convert it to VB.

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1 Answer

  1. Editorial Team

    So the answer to this is to make sure your form Dll is copied to the directory where your Excel Add-In is sitting.

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