I've never used VB.net but I have used VB6 so some of my info might be a bit off.<BR><BR>I don't know that there is any magic way to export to a csv. I think that you may have to write it out ...

Could it be erroring out because of the custom columns you are trying to add to it?<BR><BR>I don't know the answer off the top of my head, but you could do something as simple as DataGridView1 = new ...