c# - GetResponse() Error in the PayPal functionality when trying to checkout -


so i'm following wingtip toy tutorial, , know sort of old error free until got point needed checkout paypal using sandbox developing tool

this code error occurs 

//retrieve response returned nvp api call paypal.         httpwebresponse objresponse = (httpwebresponse)objrequest.getresponse();         string result;         using (streamreader sr = new streamreader(objresponse.getresponsestream()))         {             result = sr.readtoend();         }          return result;

and error im getting when run it

[protocolviolationexception: must write contentlength bytes request stream before calling [begin]getresponse.]

please note i'm beginner

edit: full code here

public string httpcall(string nvprequest)     {         string url = pendpointurl;          string strpost = nvprequest + "&" + buildcredentialsnvpstring();         strpost = strpost + "&buttonsource=" + httputility.urlencode(bncode);          httpwebrequest objrequest = (httpwebrequest)webrequest.create(url);         objrequest.timeout = timeout;         objrequest.method = "post";         objrequest.contentlength = strpost.length;              try         {             using (streamwriter mywriter = new streamwriter(objrequest.getrequeststream()))             {                 mywriter.write(strpost);             }         }         catch (exception)         {             // no logging tutorial.         }          //retrieve response returned nvp api call paypal.         httpwebresponse objresponse = (httpwebresponse)objrequest.getresponse();         string result;         using (streamreader sr = new streamreader(objresponse.getresponsestream()))         {             result = sr.readtoend();         }          return result;     } 

objrequest.contentlength = strpost.length;

what trying here? framework sets content length automatically. content length in bytes have given number of characters.

that's why error complains: have written different number of characters said write.

delete line.

your code become lot simpler if used httpclient. should 5 lines.


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