Hello, I'm new to programming in Excel but I have in VB.net. I was having
problems finding solutions in VBA and decided to try VSTO. Still lost...
Here's the problem:

I need to create a function (that can be added into a cell within the
workbook on a seperate worksheet). Our company is currently working with a
Program that uses an Excel workbook as it's data source and
formulaes/functions.

The Spreadsheet/Data table is already within the Excel workbook, what I need
is to be able to query the data or filter using criteria(es) from another
part of the workbook and then with the results of the array/filtered table
get the MIN/MAX/AVG of one specific column (which is actually being called by
the external Program, this is why I need a UDF). The query/criteria changes
multiple times in multiple areas of the workbook which will then be exported
by the external program.

I'm becoming very familiar with vba and can't figure out to how program
Excel in VB.net. HELP!!!
Thanks