using   System.Runtime.InteropServices;



        [DllImport("User32")]
        static extern IntPtr FindWindow(string className, string windowName);
        [DllImport("User32")]
        static extern bool SetWindowText(IntPtr hwnd, string windowName);

        private void Form1_Load(object sender, EventArgs e)
        {
            SetWindowText(FindWindow("CabinetWClass", null), "哈哈哈哈");
        }