Creating add-in for Excel using C#

Programming in C#: Creating add-in for Excel using C# on newest questions tagged c# – Stack Overflow

I want to use C# class methods in Excel. Can anybody guid me how to do it ?
The C# component will be excel add-in. How to create setup for this addin, so that I just need to give setup to user which will install add-in at client’s machine. User should not need to do any other steps like registering the C# dll.

source: http://stackoverflow.com/questions/2020234/creating-add-in-for-excel-using-c-sharp
Programming in C#: programming-in-c