GridView SelectedRow and Paging

[Keith G]

I have an event fired by a GridView ButtonField that extracts data from the
currently selected row with this code:

string quote = GV1.SelectedRow.Cells[1].Text;
string fmat = GV1.SelectedRow.Cells[2].Text;

This works fine until I turn on Paging, after which I get this error:

Object reference not set to an instance of an object

Is there something I need to set within OnPageIndexChanged to reset the
SelectedRow.


Thanks

Keith