.net - How do I download a PDF from an HTML webpage-submitted POST form using C#? -

i'm trying programmatically download pdf document c# windows form application. right now, i've got far enough unique url each page goes download pdf.

each link webpage submits form via post page loaded

function window_onload() {                 form1.submit();             } 

then pdf starts downloading. stop pdf downloading , save automatically local machine. reason want because there around 15-20 pdfs need download every week.

i use httpwebrequest object.

depending on size pdfs, , response time of servers asynchronously or synchronously. synchronous flavor using getresponse() method.

void dopdfdownload(string strmyurl, string strpostdata, string savelocation) {     //create request     var wr = (httpwebrequest)webrequest.create(myurl);     wr.method = "post";     wr.contentlength = strpostdata.length;     //identify content type... strpostdata should url encoded per next         //declaration     wr.contenttype = "application/x-www-form-urlencoded";     //just measure, set cookies if necessary session management, etc.     wr.cookiecontainer = new cookiecontainer();      using(var sw = new streamwriter(wr.getrequeststream()))     {         sw.write(strpostdata);     }      var resp = wr.getresponse();      //feeling rather lazy @ point, if need further code writing     //response stream file stream, can provide.     //...  } 

the following little method copy/paste linqpad idea of how these classes work.

void dospeedtestdownloadfromfcc() {  string strmyurl = "http://data.fcc.gov/api/speedtest/find?latitude=38.0&longitude=-77.5&format=json";     //create request     var wr = (httpwebrequest)webrequest.create(strmyurl);     wr.contentlength = strpostdata.length;             //note changed method webservice's standard.             //no content type on requests.     wr.method = "get";     //just measure, set cookies if necessary session management, etc.     wr.cookiecontainer = new cookiecontainer();       var resp = wr.getresponse();      //...     using(streamreader sr = new streamreader(resp.getresponsestream()))     {                     //here write file disk using preferred method                     //in linq pad, outputs text console.         sr.readtoend().dump();     }  }