asp.net MD5加密函数(c#)

 /// <summary>
  /// 用md5加密
  /// </summary>
  /// <param name="Sourcein">输入的数据</param>
  /// <returns></returns>
  public static string MD5(string Sourcein)
  {  
   MD5CryptoServiceProvider MD5CSP = new MD5CryptoServiceProvider();
   byte[] MD5Source = System.Text.Encoding.UTF8.GetBytes(Sourcein);
   byte[] MD5Out = MD5CSP.ComputeHash(MD5Source);
   return Convert.ToBase64String(MD5Out);
  }