How to set focus on a particular column header in a datagridview?

private void MyButton_Click(object sender, EventArgs e)
    {
    if (int.TryParse(MyTextBox.Text, out int colNo))
        {
        myDataGridView.Sort(myDataGridView.Columns[colNo], ListSortDirection.Ascending);
        }
    }

private void MyOtherButton_Click(object sender, EventArgs e)
    {
    if (int.TryParse(MyTextBox.Text, out int colNo))
        {
        myDataGridView.Sort(myDataGridView.Columns[colNo], ListSortDirection.Descending);
        }
    }