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    <p>using <a href="http://www.fiddler2.com" rel="nofollow">fiddler</a> I think this is what you want:</p> <pre><code> class Program { static string Extract(string s, string tag) { var startTag = String.Format("id=\"{0}\" value=\"", tag); var eaPos = s.IndexOf(startTag) + startTag.Length ; var eaPosLast = s.IndexOf('"', eaPos); return s.Substring(eaPos, eaPosLast-eaPos); } static void Main(string[] args) { WebClient webClient = new WebClient(); var firstResponse = webClient.DownloadString(@"http://www.mcxindia.com/sitepages/BhavCopyDateWise.aspx"); var forms = new NameValueCollection(); forms["__EVENTARGUMENT"] = ""; forms["__VIEWSTATE"] = Extract(firstResponse, "__VIEWSTATE"); forms["mTbdate"] = "12/22/2011"; forms["__EVENTVALIDATION"] = Extract(firstResponse, "__EVENTVALIDATION"); forms["mImgBtnGo.x"] = "10"; forms["mImgBtnGo.y"] = "10"; forms["ScriptManager1"] = "MupdPnl|mImgBtnGo"; // forms["__EVENTTARGET"] = "btnLink_Excel"; webClient.Headers.Set(HttpRequestHeader.ContentType, "application/x-www-form-urlencoded"); String secondResponse = UTF8Encoding.UTF8.GetString( webClient.UploadValues(@"http://www.mcxindia.com/sitepages/BhavCopyDateWise.aspx", "POST", forms) ); forms = new NameValueCollection(); forms["__EVENTARGUMENT"] = ""; forms["__VIEWSTATE"] = Extract(secondResponse, "__VIEWSTATE"); forms["mTbdate"] = "12/22/2011"; forms["__EVENTVALIDATION"] = Extract(secondResponse, "__EVENTVALIDATION"); // forms["mImgBtnGo"] = "?"; forms["__EVENTTARGET"] = "btnLink_Excel"; webClient.Headers.Set(HttpRequestHeader.ContentType, "application/x-www-form-urlencoded"); var responseData = webClient.UploadValues(@"http://www.mcxindia.com/sitepages/BhavCopyDateWise.aspx", "POST", forms); System.IO.File.WriteAllBytes(@"c:\prj\11152011.csv", responseData); } } </code></pre>
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