关于采集aspx页面的问题


最近要做个数据采集的程序，但无法获取采集页面的返回值，希望论坛中有经验的哥们指点下，下面是请求的头部信息：
POST /ProcessLogin.aspx HTTP/1.1
Host: www.*****.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:9.0.1) Gecko/20100101 Firefox/9.0.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-cn,zh;q=0.5
Accept-Encoding: gzip, deflate
Accept-Charset: GB2312,utf-8;q=0.7,*;q=0.7
Connection: keep-alive
Referer: http://www.*****.com/head.aspx?20110303
Cookie: __utma=185542641.1709314172.1324883830.1324883830.1324883830.1; __utmb=185542641.1.10.1324883830; __utmc=185542641; __utmz=185542641.1324883830.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); ASP.NET_SessionId=b2iunl45z2dgklqlvnfnsd45; MuSou=20110303