Question

This is what I’m currently using to implement a “Check all” feature on a bound DataGridView:

int max = ((DataTable)dataGridRes.DataSource).Rows.Count;
for (int i = 0; i < max; i++)
{
    if(((DataTable)dataGridRes.DataSource).Rows[i].Field<long>(0) == 0)
        ((DataTable)dataGridRes.DataSource).Rows[i].SetField(0, 1);
}

However this code is hopelessly slow. On a 625 row DataTable it takes aprox 5 seconds to complete on my computer. Very unacceptable.

What am I doing wrong? What better way can I use to do bulk edits on a DataGridView?

Answer 1

I found a way to speed it up to an acceptable performance. Essentially unbind the control, do the update on the DataTable and rebind it.

DataTable dt = (DataTable)dataGridRes.DataSource;
dataGridRes.DataSource = null;

for (int i = 0; i < dt.Rows.Count; i++)
    dt.Rows[i].SetField(0, 1);

dataGridRes.DataSource = dt;