Question

Here’s what I’m trying to do in my Winforms DataGridView:

private void dataGridView1_CellLeave(object sender, DataGridViewCellEventArgs e)
{
    if (e.ColumnIndex > 1)
    {
        string tmpValue = Convert.ToString(dataGridView1[e.ColumnIndex, e.RowIndex].Value);

        if (tmpValue.Length >= 3)
        {
            //At thsi point, I'm 100% sure that tmpValue has "253" as it's value.
            dataGridView1[e.ColumnIndex, e.RowIndex].Value = tmpValue.Substring(0, 2);
        }
    }
}

Yet, the value isn’t changed of the cell I leave.

If I type 258 in the cell and leave, it should have 25.

Any suggestions?

Answer 1

You may need to cause validation to occur for it to take place. At the end, add this.Validate();

You might also want to try using the CellEndEdit event instead, since this even is fired after the cell leave and validation events.