Operation cannot be performed in this event handler

Question

I\'m trying to delete a row from a DataGridView
I use two types of instuctions
A

VouchersDGV.Rows.Clear()

B

Answer 1

I had the same problem. In my case I need to save changes when the user changes selection in DataGridView. I use RowValidating event to check any changes and ask the user to save them. But when I tried to save changes inside this handler I got exception "Operation cannot be performed in this event handler."

I was needed an event that rises after RowValidating and where I can save my changes. I didn't find such event. So I use timer for that. I start timer in RowValidating event and save my data when timer ticks.

Here is my code:

private void timerForSaving_Tick(object sender, EventArgs e)
{
    if (_saveChanges)
    {
        timerForSaving.Stop();
        SaveData();
        _saveChanges = false;
    }
}

private void dataGridView1_RowValidating(object sender, DataGridViewCellCancelEventArgs e)
{
    if (_hasUnsavedChanges)
    {
        DialogResult dr = MessageBox.Show("Do you want to save changes?", "Question",
                                            MessageBoxButtons.YesNo, MessageBoxIcon.Question);

        if (dr == DialogResult.Yes)
        {
            e.Cancel = true;
            _saveChanges = true;
            timerForSaving.Start();
        }
    }
}