#region 实现窗口拖动
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();

        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

        private void frm_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, 0x0112, 0xF012, 0);
        }
        #endregion

　　　　 //调用者
        private void FormMain_MouseDown(object sender, MouseEventArgs e)
        {
            frm_MouseDown(this, e);
        }

foreach (Control c in  this.Controls)
        {
            if (!Type.Equals(c.GetType(), button1.GetType()))
                c.MouseDown += new System.Windows.Forms.MouseEventHandler(this.frm_MouseDown);
        }