using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
class Util
{
/// <summary>
/// 计算字符串MD5值
/// </summary>
/// <param name="source"></param>
/// <returns>
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
class Util
{
/// <summary>
/// 计算字符串MD5值
/// </summary>
/// <param name="source"></param>
/// <returns>