Adding Text to DataGridView Row Header

private void dtgworkingdays_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
    this.FillRecordNo();
}


private void FillRecordNo()
{
    for (int i = 0; i < this.dtworkingdays.Rows.Count; i++)
    {
        this.dtgworkingdays.Rows[i].HeaderCell.Value = (i + 1).ToString();
    }
}

Also see Show row number in row header of a DataGridView.

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