Fire up Excel and let Excel do the work?
Why emulating all the filtering, sorting, formula editing, etc. in a wpf application?
Or use a commertially available component for reading and writing the *files*, like
http://www.tmssoftware.com/site/flexcelnet.asp[
^] and only provide a simple grid editor.
We have no clue what your *real* requirements are - depending on your requirements, you open up the box of Pandora or it's a simple solution (or somethin in between).
E.g. do you want the full feature set from Excel, like all editing and error handling, all graphics capabilities, all relations and multi sheets, etc. etc.? Or do you just want to enter some data in a data grid, no sorting, no graphics, no filtering, no fancy stuff?
Cheers
Andi
PS: And please stop "whining". You do not show us any of your effort. This is not the place for "gimme solution". No obvious effort from your side usually does result in no answer.