C#模拟带加密锁的页面登陆

 用HttpAnalyzerFullV3 抓POSTDATA：
 __VIEWSTATE=dDwxMDM1MzYwMzUxO3Q8O2w8aTwxPjs+O2w8dDw7bDxpPDM+Oz47bDx0PHA8O3A8bDxvbmNsaWNrOz47bDxqYXZhc2NyaXB0OnJldHVybiBWYWxpZGF0ZShlUGFzcywgJ3h3a2VmcXR5dXJkcXhvcmp3Zm0nLCB0eHRTTik7Pj4+Ozs+Oz4+Oz4+Oz6MXGpasPyLI11iO03NmT0fiOlKrw== //固定的UserPIN =666666 //固定txtSN=42F81BC171235F34 /固定h_SN=  //无h_login=  //无Digest=9D06A389A090ED2CE2A0D4E8505F673E   //每次都不一样btnLogin=登录   //固定
Headers：(Request-Line):POST /ccpm/login.aspx HTTP/1.1
Accept:image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
Referer:http://ccpm.gdhlzj.com/ccpm/login.aspx
Accept-Language:zh-cn
User-Agent:Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; TheWorld)
Content-Type:application/x-www-form-urlencoded
UA-CPU:x86
Accept-Encoding:gzip, deflate
Host:ccpm.gdhlzj.com
Content-Length:359
Connection:Keep-Alive
Cache-Control:no-cache
Cookie:ASP.NET_SessionId=i2v3xznwrhtgjf45mauosk55    //会变
Stream:POST /ccpm/login.aspx HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
Referer: http://ccpm.gdhlzj.com/ccpm/login.aspx
Accept-Language: zh-cn
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; TheWorld)
Content-Type: application/x-www-form-urlencoded
UA-CPU: x86
Accept-Encoding: gzip, deflate
Host: ccpm.gdhlzj.com
Content-Length: 359
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: ASP.NET_SessionId=i2v3xznwrhtgjf45mauosk55__VIEWSTATE=dDwxMDM1MzYwMzUxO3Q8O2w8aTwxPjs%2BO2w8dDw7bDxpPDM%2BOz47bDx0PHA8O3A8bDxvbmNsaWNrOz47bDxqYXZhc2NyaXB0OnJldHVybiBWYWxpZGF0ZShlUGFzcywgJ3h3a2VmcXR5dXJkcXhvcmp3Zm0nLCB0eHRTTik7Pj4%2BOzs%2BOz4%2BOz4%2BOz6MXGpasPyLI11iO03NmT0fiOlKrw%3D%3D&Digest=9D06A389A090ED2CE2A0D4E8505F673E&UserPIN=666666&btnLogin=%B5%C7%C2%BC&h_SN=&txtSN=42F81BC171235F34&h_login=抓到这些 后 然后怎么办？ POST会变的数据怎么处理啊？
来人指点下吧～COME  ON !