I would like to have a simple program which would update a spreadsheet from a simple VB.NET GUI.

I would like to submit a value from my VB.NET GUI, to the spreadsheet. THe spreadsheet would then recalculate any associated fields/records.

SO A B C
2 2 =sum(A+B) 4

Updated column A via VB.NET and then C would be recalculated by teh spreadsheet to = 5.

to A B C
3 2 5

Not the most technically demanding challenge ever, but I have not programmed for a while and am starting off again! So if anyone could help me with an example of the source code to update Excel Spreadsheets that would be most appreciated. Thanks a lot.