如何更改winform DataGridview标题的颜色？

using System;
using System.Drawing;
using System.Windows.Forms;

public class CustomDataGridView : DataGridView
{
    public CustomDataGridView()
    {
        this.CellPainting += CustomDataGridView_CellPainting;
    }

    private void CustomDataGridView_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
    {
        if (e.RowIndex == -1) // 检查是否是标题行
        {
            e.PaintBackground(e.CellBounds, true);
            e.Handled = true; // 标记事件已处理

            // 设置标题行的颜色
            using (Brush brush = new SolidBrush(Color.Blue))
            {
                e.Graphics.DrawString(e.Value.ToString(), this.Font, brush, e.CellBounds.X + 2, e.CellBounds.Y + 2);
            }
        }
    }
}

public class MainForm : Form
{
    private CustomDataGridView dataGridView;

    public MainForm()
    {
        dataGridView = new CustomDataGridView();
        dataGridView.Dock = DockStyle.Fill;
        dataGridView.Columns.Add("Column1", "Column 1");
        dataGridView.Columns.Add("Column2", "Column 2");
        dataGridView.Columns.Add("Column3", "Column 3");

        this.Controls.Add(dataGridView);
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new MainForm());
    }
}