如何在表单中添加背景图像的最佳方法 - WinForm？

public Form1()
{
    this.TransparencyKey = Color.Empty;
    this.SetStyle(ControlStyles.DoubleBuffer, true);
    this.SetStyle(ControlStyles.UserPaint, true);
    this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
    this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);

    InitializeComponent();
}