I have a strange problem. I have a TabControl with two TabPages. Each page has a datagridview. Both datagridviews are pop
TabControl
TabPages
datagridview
datagridviews
THe only thing I can se at the moment is that you are not doing this on tabpage 2
dataGridView1.Sort(dataGridView1.Columns[1], ListSortDirection.Ascending);
try
dataGridView2.Sort(dataGridView2.Columns[1], ListSortDirection.Ascending);