C# Excel Interop question.

[jol]

I've encountered the same problem than the following topic:

http://www.xtremedotnettalk.com/showthread.php?t=96044

 

I would like to allow user to call my own defined function using formula, the behavior of my function is to change a set of cells. However following the previous topic it seems impossible to do it.

 

So what is the way to follow to update a set of cells using user defined function ?

 

Thank you,

 

Jol