post请求带字段和表头到某个网站

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__EVENTTARGET
__EVENTARGUMENT
ctl00$txtSearch
ctl00$ContentPlaceHolder1$Answers rdoOption1
ctl00$ContentPlaceHolder1$btnShowAnswer Show Answer怎么用post请求把上面这些字段带到这个http://www.dotnetspider.com/questions/ViewQuestion.aspx?QuestionId=16529&网站
还有表头