Different forms, different results
// Use GB2312 encoding the string into a byte array. try { inputBye = Encoding.GetEncoding(charset).GetBytes(encypStr); } catch (Exception ex) { inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr); } outputBye = m5.ComputeHash(inputBye); m5.Clear(); retStr = System.BitConverter.ToString(outputBye); retStr = retStr.Replace("-", "").ToLower(); return retStr; } public static string md5(string str) { try { MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); byte[] bytValue, bytHash; bytValue = System.Text.Encoding.UTF8.GetBytes(str); bytHash = md5.ComputeHash(bytValue); md5.Clear(); string sTemp = ""; for (int i = 0; i < bytHash.Length; i++) { sTemp += bytHash[i].ToString("X").PadLeft(2, '0'); } str = sTemp.ToLower(); } catch (Exception e) { Console.WriteLine(e.Message); } return str; }