C#DataGridView边框颜色修改(Pen自定义颜色)

在Paint事件中写入代码，如下：

private void dataGridView1_Paint(object sender, PaintEventArgs e)
        {
            DataGridView dgv = (DataGridView)sender;
            Pen p =new Pen(Color.FromArgb(23, 34, 65));
            e.Graphics.DrawRectangle(p, new Rectangle(0, 0, dgv.Width - 1, dgv.Height - 1));
        }