如何将一串string字符串转换成CookieCollection

using System.Net;
using System.IO;
using System.Text;

class Test
{
[STAThread]
static void Main(string[] args)
{
//

// TODO: 在此处添加代码以启动应用程序

//

string url = "http://localhost/csdn2/1.asp";

// <%

// if request("aa")="zhuye" then session("ok")="ok"

// if session("ok")="ok" then

// response.write("登录")

// else

// response.write("没有登录")

// end if

// %>

string indata = "aa=zhuye";
string outdata = "";
CookieContainer myCookieContainer = new CookieContainer();
//新建一个CookieContainer来存放Cookie集合

HttpWebRequest myHttpWebRequest = (HttpWebRequest) WebRequest.Create(url);
//新建一个HttpWebRequest

myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
myHttpWebRequest.ContentLength = indata.Length;
myHttpWebRequest.Method = "POST";
myHttpWebRequest.CookieContainer = myCookieContainer;
//设置HttpWebRequest的CookieContainer为刚才建立的那个myCookieContainer

Stream myRequestStream = myHttpWebRequest.GetRequestStream();
StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
myStreamWriter.Write(indata);
//把数据写入HttpWebRequest的Request流

myStreamWriter.Close();
myRequestStream.Close();
//关闭打开对象

HttpWebResponse myHttpWebResponse = (HttpWebResponse) myHttpWebRequest.GetResponse();
//新建一个HttpWebResponse

myHttpWebResponse.Cookies = myCookieContainer.GetCookies(myHttpWebRequest.RequestUri);
//获取一个包含url的Cookie集合的CookieCollection

Stream myResponseStream = myHttpWebResponse.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("gb2312"));
outdata = myStreamReader.ReadToEnd();
//把数据从HttpWebResponse的Response流中读出

myStreamReader.Close();
myResponseStream.Close();
Console.WriteLine(outdata);
//显示"登录"

//拿到了Cookie，再进行请求就能直接读取到登录后的内容了

myHttpWebRequest = (HttpWebRequest) WebRequest.Create(url);
myHttpWebRequest.CookieContainer = myCookieContainer;//*

//刚才那个CookieContainer已经存有了Cookie,把它附加到HttpWebRequest中则能直接通过验证

myHttpWebResponse = (HttpWebResponse) myHttpWebRequest.GetResponse();
myHttpWebResponse.Cookies = myCookieContainer.GetCookies(myHttpWebRequest.RequestUri);
myResponseStream = myHttpWebResponse.GetResponseStream();
myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("gb2312"));
outdata = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
Console.WriteLine(outdata);
//再次显示"登录"

//如果把*行注释调，就显示"没有登录"

}
}