How to make DataGridViewLinkColumn underline and change background color?

I have a DataGridViewLinkColumn.How can I make the header(row = -1) as underline and change it's background color?

Solution

private void dataGridView_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
	if (e.RowIndex == -1 && e.ColumnIndex == 2)
	{
		e.Handled = true;
		e.Graphics.FillRectangle(Brushes.cont, e.CellBounds);
		StringFormat sf = new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center };
		Font f = new Font(e.CellStyle.Font, FontStyle.Underline);
		e.Graphics.DrawString(e.Value.ToString(), f, new SolidBrush(e.CellStyle.ForeColor), e.CellBounds, sf);
	}
}