/*
測試環(huán)境:WinXP SP3、Visual Studio 2008 SP1、Visual Studio 2010 SP1
更新日期：2014-04-23
*/
public string CalculateMD5Hash(string input)
{
  MD5 md5 = System.Security.Cryptography.MD5.Create();
  byte[] inputBytes = System.Text.Encoding.UTF8.GetBytes(input);
  byte[] hash = md5.ComputeHash(inputBytes);
  // step 2, convert byte array to hex string
  StringBuilder sb = new StringBuilder();
  for (int i = 0; i < hash.Length; i++)
  {
  sb.Append(hash[i].ToString("X2"));
  }
  return sb.ToString();
}//end func