Basic of XLL Excel Addin - Need to invoke a C# API from Excel [closed]
I am quite new to creating excel addins. Earlier I used to create a tlb for .NET libraries. I used to make my .NET class COMVISIBLE and create a Com callable wrapper and register as a tlb to call from Excel (using regasm). I now have a math library written in C#. Got to know there is something called XLL and UDFs which I can use to invoke API's from the DLL. Little confused about XLA, XLL and UDFs. Not sure what should I do to call my API's. Not sure where to get started. Any help would be helpful. Thanks Mani Take a look at XLDNA , XLL+ , Addin Express , VSTO etc. Don't forget to take a look