public static void Save(Library sourceLib, string Path)
        {
            try
            {
                string[] chn = new string[Library.CurrentLength()];
                string[] eng = new string[Library.CurrentLength()];
                string[] frequencyString = new string[Library.CurrentLength()];

                for (int i = 0; i < Library.CurrentLength(); i++)
                {
                    //if (sourceLib.GetEntry(i) == null)
                    //{
                    //chn[i] = "";
                    //eng[i] = "";
                    //frequencyString[i] = "0";
                    //}//prevent empty entry : string ""
                    //else
                    //{
                    chn[i] = sourceLib.GetEntry(i).GetChinese();
                    eng[i] = sourceLib.GetEntry(i).GetEnglish();
                    frequencyString[i] = sourceLib.GetEntry(i).GetFrequency().ToString();

                    //}
                }

                System.IO.File.WriteAllLines(frequencyPath, frequencyString);
                System.IO.File.WriteAllLines(engPath, eng);
                System.IO.File.WriteAllLines(chnPath, chn);
            }
            catch { DeleteLibrary(); }
        }