get new entered DataGridView cell value using c#

Question

I'm trying to get the new cell value of a DataGridView when the cell was null before. I'm using C# and this code:

private void gridViewTimes_CellLeave(object sender, DataGridViewCellEventArgs e)
{
    string value = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
}

This works fine when the cell value was not null before. But if the cell was null before it throws the exception

Exception:

Object reference not set to an instance of an object .

I'm a bit confused about this because when I leave the cell I wrote something in the cell so it isn't null anymore. Or am I understanding this wrong?

Any suggestions?

Answer 1

Check if the value is not null before assigning:

private void gridViewTimes_CellLeave(object sender, DataGridViewCellEventArgs e)
{
    if(dataGridView1.Rows[e.RowIndex].Cells[0].Value != null)
    {
        string value = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
    }
}

Answer 2

CellLeave event is fring before value is actually changes. Use CellValueChanged event.