关于URL参数的加密
 
URL参数一般都需要采取加密技术，来隐藏一些敏感信息。方法如下：

1.把数据绑定到GridView控件添加一个超链接和一个模板字段,模板字段的链接参被加密。

<asp:GridView ID="GridView1" runat="server" >
     <Columns>
        <asp:CommandField ShowSelectButton="True" />
        <asp:HyperLinkField DataNavigateUrlFields="AccountID,AccountCode"
            DataNavigateUrlFormatString="DemoViewState.htm?id={0}&Code={1}"
            DataTextField="AccountID" HeaderText="连接" />
        <asp:TemplateField HeaderText="字符串">
            <ItemTemplate>
               <a href="DemoViewState.htm?id=<%# Helper.Encode(DataBinder.Eval(Container.DataItem,"AccountCode").ToString(),"sseertyu") %>"><%# DataBinder.Eval(Container.DataItem,"AccountCode") %></a>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

2.关键看看加密类吧，调用Helper类可完成加密。

public class Helper
{
    public Helper()
 {
  //
  //TODO: 在此处添加构造函数逻辑
  //
 }
     public static string Decode(string str, string key)//解密函数

　　        {

　　            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();

　　            provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));

　　            provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));

　　            byte[] buffer = new byte[str.Length / 2];

　　            for (int i = 0; i < (str.Length / 2); i++)

　　            {

　　                 int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);

　　                 buffer[i] = (byte)num2;

　　            }

　　            MemoryStream stream = new MemoryStream();

　　             CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);

　　             stream2.Write(buffer, 0, buffer.Length);

　　             stream2.FlushFinalBlock();

　　             stream.Close();

　　            return Encoding.GetEncoding("GB2312").GetString(stream.ToArray());

　　         }
     public static string Encode(string str, string key)//加密函数
     {

         DESCryptoServiceProvider provider = new DESCryptoServiceProvider();

         provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));

         provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));

         byte[] bytes = Encoding.UTF8.GetBytes(str);

         MemoryStream stream = new MemoryStream();

         CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);

         stream2.Write(bytes, 0, bytes.Length);

         stream2.FlushFinalBlock();

         StringBuilder builder = new StringBuilder();

         foreach (byte num in stream.ToArray())
         {

             builder.AppendFormat("{0:X2}", num);

         }

         stream.Close();

         return builder.ToString();

     }
}