VS C# 2008拖动窗体

using System.Runtime.InteropServices;

//窗体的拖动
   [DllImport("user32.dll")]
   public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        public const int w = 0x0112;
        public const int s = 0xF010;
        public const int h = 0x0002;

private void SHTNews_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, w, s + h, 0);
        }