title: Creating add-in for Excel using C#
body: <p>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.</p>