How To Change indexes of column in gridview

Actually this client have the cable network business so he need to print bill every month.And he want to print bill as location wise but after that he don't need again to sort out the bill.
ex.
suppose when i give print for the location 1 and i get the print as in serial no like custno 1,2,3,4..
but my customer no 3 is neighbor of customer no 1 so i need to print in 1,3,2,4..
for that reason i want to give him some sort out option in gridview because of that he can arrange customer as his own way

helloo...any solution for this question??

I tried this code,it removes the row which i selected but gives exception while inserting row.
Error: "Programmatically you can't insert row while the control is databind "

private void btnUp_Click(object sender, EventArgs e)
{
DataGridView grid = gridTasks;
try
{
int totalRows = grid.Rows.Count;
int idx = grid.SelectedCells[0].OwningRow.Index;
if (idx == 0)
return;
int col = grid.SelectedCells[0].OwningColumn.Index;
DataGridViewRowCollection rows = grid.Rows;
DataGridViewRow row = rows[idx];
rows.Remove(row);
rows.Insert(idx - 1, row); // getting exception here
grid.ClearSelection();
grid.Rows[idx - 1].Cells[col].Selected = true;

}
catch { }
}