使用DESCryptoServiceProvider类对数据或者文件进行加密解密

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Security.Cryptography;
using System.IO;
using System.Text;
namespace CommonFunction

using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
namespace CommonFunction