Creating Excel Add-on

Hello, glad to be part of the forum. Hope to learn a lot! I am actually setting out to start a project at work. I know some C++ and some C, but not extensively. I need to develop an add-on for Excel. I am not sure where to start.

The add-on is actually supposed to be a client that is supposed to connect remotely to another application, where it will send in commands through a server. Essentially I am planning on running another program through Excel.
Most of the code I need to do that has already been coded.

I just need to know how to make an add-on, and how to manipulate the Excel application object. That would be a great starting point I think. Also, if you guys know of any pre-written code freely available on line, that would be great, the less I have to code the better. Thanks!

Office add-ins are developed in .NET. You might want to check out Add-in Express (https://www.add-in-express.com/ ). It makes it a bit easier to write Office add-ins, plus there's a forum where you can get support directly from the developers.
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