Question

I have a DataGridView with a checkbox column. I’m trying to create a select/deselect all button. The code for changing the values is easy enough, but the performance is horrendous.

for (int i = 0; i < dgv.RowCount; i++)
{
    dgv.Rows[i].Cells["Selected"].Value = _selectAll;
}

_selectAll is simply a toggle bool variable. Is there a better way to do this where the performance is fast? I’ve tried changing the value in the underlying DataTable as well. It still takes several seconds for just a few hundred rows, but most work will be done on thousands of rows.

EDIT & SOLUTION (2011/10/4)

The main problem was in the DGV properties. Once I set,

dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells;

performance improved dramatically (per MSDN DataGridView Performance).
The solutions suggested as of this edit would also improve performance slightly.

Answer 1

Thanks a lot, by setting the AutoSizeColumnsMode property

dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells;

the performance is much better…