[DllImport("user32.dll")]
        public static extern int SendMessage(int hWnd, // handle to destination window 
        uint Msg, // message 
        int wParam, // first message parameter 
        int lParam // second message parameter 
        );

        [DllImport("gdi32")]
        public static extern int AddFontResource(string lpFileName);
          
        private void installFont()
        {

string WinFontDir = System.Environment.GetEnvironmentVariable("windir") + "\\fonts/;
            string FontFileName = "MSYH.TTF";
            string FontName = "MSYH";
            int Ret;
            int Res;
            string FontPath;
            const int WM_FONTCHANGE = 0x001D;
            const int HWND_BROADCAST = 0xffff;
            FontPath = WinFontDir + "\\" + FontFileName;
            if (!File.Exists(FontPath))
            {
                File.Copy(System.Windows.Forms.Application.StartupPath + "\\msyh.ttf/", FontPath);
                Ret = AddFontResource(FontPath);

                Res = SendMessage(HWND_BROADCAST, WM_FONTCHANGE, 0, 0);
                Ret = WriteProfileString("fonts", FontName + "(TrueType)", FontFileName);
            }

        }