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Editorial Team
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Asked: 2026-05-18T02:25:43+00:00

I built a VB Windows Forms application a while back using VS05 (or VS08?

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I built a VB Windows Forms application a while back using VS05 (or VS08? Not exactly sure) that I’ve recently converted to use VS10. I reference a .dll called ExcelPackage (another article, usage) so that I can create/manipulate Excel docs serverside. This app has worked fine on my old computer (PC/Vista) for a number of years. However, I have tried to move it to my new computer (PC/Win7 64-bit), and I can’t get it to recognize the ExcelPackage .dll.

I have tried recompiling the .dll in VS10 and dropping the new .dll in my bin folder and re-referencing it. When I do this, before I try building, all my errors go away and I am actually able to navigate the class using VS10’s built in ability (mouse over Imports OfficeOpenXml and you get a dropdown arrow that allows you to go through the classes). After I build, I get a green squiggly under my Imports OfficeOpenXml statement (can’t find the reference).

I did some research and discovered that the .dll containing System.IO.Packaging has been moved around in .NET 3.0 and even re-referenced the new .dll, rebuilt, re-added, re-referenced, still no dice.

Am I missing something, or how do I get my application to recognize this assembly so that I can compile and continue working?

Thanks.

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1 Answer

  1. Editorial Team

    I don’t see anything special about that project. Do note that the solution and project need to be converted. When that happens, you’ll end up targeting the .NET 2.0 framework. That won’t work out well, it has an assembly reference to WindowsBase, a 3.0 assembly. Make sure you update the target.

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