C# codepage转码BIG5

static void savebig5()
        {
            StringBuilder sb = new StringBuilder();
            string source = "褶釧謠";

            foreach (var e in Encoding.GetEncodings())
            {
                byte[] unknow = Encoding.GetEncoding(950).GetBytes(source);
                string result = Encoding.GetEncoding(e.CodePage).GetString(unknow);
                sb.AppendLine(string.Format("{0} => {1} : {2}", 950, e.CodePage, result));
            }
            File.WriteAllText("big5.txt", sb.ToString());
        }