Is it possible that calling Export could open up Excel with the results of the export? I can export and have it save to a file, but am wondering if it's possible to launch Excel with the results of the export without saving to disk.
If you save it to file (it could be a temporary file), for instance "spreadsheet.xls" in the app's executing bin folder (best practice would be somewhere in the user's profile like Application Data, etc., but I'm just saying app executing bin here for example's sake), then you can call
Process.Start( "spreadsheet.xls" )
and if the user has Microsoft Excel installed the command shell will launch it with your exported file opened by default.