c# - Can't Use CookieContainer on my request, only hand made cookie works :\ -

i'm working on project use http web requests. i'm using cookie containers on requests, found doesn't work on specific request. i'm making site change it's page http request each page finds , download info want it, since page url hidden, , if press go in browser doesn't go page before goes homepage.

i found body of request can change page , worked when used cookie got using fiddler. since tried cookiecontainer info on pages same 1st page.

            (int = 2; <= _totalpag; i++)             {                 try                 {                     int _pagina = i;                     httpwebresponse response3;                     httpwebrequest request3 = (httpwebrequest)webrequest.create(lista_links_categorias[cbo_categorias.selectedindex]);                      request3.keepalive = true;                     request3.useragent = "mozilla/5.0 (windows nt 6.1; wow64) applewebkit/537.36 (khtml, gecko) chrome/35.0.1916.153 safari/537.36";                     request3.accept = "*/*";                     request3.referer = "xxxxxxxxxxx";                     request3.headers.set(httprequestheader.acceptlanguage, "en-us,en;q=0.8,pt;q=0.6");                      cookiecontainer cookiecontainer3 = new cookiecontainer();                     request3.cookiecontainer = cookiecontainer3;                      request3.method = "post";                     request3.servicepoint.expect100continue = false;                      string _body;                     if (i == 2)                     {                         _body = @"m%24m%24sm1=m%24m%24sm1%7cm%24m%24lph%24lcph%24ccatbrw%24cpl%24btpagcommd&__eventtarget=m%24m%24lph%24lcph%24ccatbrw%24cpl%24btpagcommd&__eventargument=&__viewstate_key=cafb3561-af6f-4e78-bc31-b71166377d8e&__viewstate=&txtq=&orderby=displayname&orderby=asc&produtos=21&orderby=displayname&orderby=asc&produtos=21&hdnprdlistdata=1%24%242&hdncatalogbrowser=&txtemail=&txtpass=&__asyncpost=true&";                     }                     else                     {                         _body = @"m%24m%24sm1=m%24m%24sm1%7cm%24m%24lph%24lcph%24ccatbrw%24cpl%24btpagcommd&__viewstate=&txtq=&orderby=displayname&orderby=asc&produtos=21&orderby=displayname&orderby=asc&produtos=21&hdnprdlistdata=1%24%24" + _pagina + "&hdncatalogbrowser=&txtemail=&txtpass=&__eventtarget=m%24m%24lph%24lcph%24ccatbrw%24cpl%24btpagcommd&__eventargument=&__viewstate_key=cafb3561-af6f-4e78-bc31-b71166377d8e&__asyncpost=true&";                     }                     byte[] postbytes = system.text.encoding.utf8.getbytes(_body);                       request3.contentlength = postbytes.length;                     stream stream = request3.getrequeststream();                     stream.write(postbytes, 0, postbytes.length);                     stream.close();                      using (response3 = (httpwebresponse)request3.getresponse())                     {                         var responsevalue = string.empty;                         // grab response                           using (var responsestream = response3.getresponsestream())                         {                             using (var reader = new streamreader(responsestream))                             {                                 responsevalue = reader.readtoend();                              }                         }                         if (responsevalue != "")                         {                             string _txtfilenew = @"xxxxxxxxxx\pagina" + _pagina + ".txt";                             streamwriter _sreannew = new streamwriter(_txtfilenew, true, encoding.utf8);                             _sreannew.writeline(responsevalue);                             _sreannew.close();                          }                     }                      htmlagilitypack.htmldocument doc3 = new htmlagilitypack.htmldocument();                     doc3.load(@"xxxxxxxx\pagina" + _pagina + ".txt");                     htmlnodecollection collection2 = doc3.documentnode.selectnodes(".//div[@class='produtogrelha']");                     foreach (htmlnode node2 in collection2)                     {                         string _id = node2.attributes["p"].value.replace("/n", string.empty).replace("\n", string.empty).replace("\r", string.empty).replace("&nbsp;", string.empty).trim();                         lista_ids_prods.add(_id);                     }                 } 

is there solution doesn't make me use specific cookie needs updates everyday?

thank lot

try initializing cookiecontainer before for-loop.

cookiecontainer cookiecontainer3 = new cookiecontainer(); (int = 2; <= _totalpag; i++) {     ...     request3.cookiecontainer = cookiecontainer3;     ... }