asp.net - Error : The underlying connection was closed: The connection was closed unexpectedly. -

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i tried suggestions in other posts , didn't work. i'm getting error when tried send request , getting response getresponse().

my codes this,

protected string createsalerequest(double amount, int installment)   {     string request = "";     try     {       xmlnode node = null;       xmldocument _msgtemplate = new xmldocument();       _msgtemplate.loadxml("<?xml version=\"1.0\" encoding=\"utf-8\" ?><epaymentmsg versioninfo=\"2.0\" tt=\"request\" rm=\"direct\" ct=\"money\">" +       "<operation actiontype=\"sale\"><opdata><merchantinfo merchantid=\"\" merchantpassword=\"\" />" +       "<actioninfo><trnxcommon trnxid=\"\" protocol=\"156\"><amountinfo amount=\"0\" currency=\"792\" /></trnxcommon><paymenttypeinfo>" +       "<installmentinfo numberofinstallments=\"0\" /></paymenttypeinfo></actioninfo><paninfo pan=\"\" expirydate=\"\" cvv2=\"\" brandid=\"\" />" +       "<orderinfo><orderline>0</orderline></orderinfo><orgtrnxinfo /><customdata></customdata><cardholderip></cardholderip></opdata></operation></epaymentmsg>");       node = _msgtemplate.selectsinglenode("//epaymentmsg/operation/opdata/merchantinfo");       node.attributes["merchantid"].value = "006100200140200";       node.attributes["merchantpassword"].value = "123";       node = _msgtemplate.selectsinglenode("//epaymentmsg/operation/opdata/actioninfo/trnxcommon");       node.attributes["trnxid"].value = guid.newguid().tostring();       node = _msgtemplate.selectsinglenode("//epaymentmsg/operation/opdata/actioninfo/trnxcommon/amountinfo");       string gonderilecekamount = amount.tostring("####.00");       gonderilecekamount = gonderilecekamount.replace(",", ".");       node.attributes["amount"].value = gonderilecekamount;       node.attributes["currency"].value = "949";       node = _msgtemplate.selectsinglenode("//epaymentmsg/operation/opdata/actioninfo/paymenttypeinfo/installmentinfo");       node.attributes["numberofinstallments"].value = "0";       node = _msgtemplate.selectsinglenode("//epaymentmsg/operation/opdata/paninfo");       node.attributes["pan"].value = "4022751585445574";       node.attributes["expirydate"].value = "201406";       node.attributes["cvv2"].value = "408";       node.attributes["brandid"].value = "visa";       node = _msgtemplate.selectsinglenode("//epaymentmsg/operation/opdata/cardholderip");       node.innertext = "10.20.30.40";       request = _msgtemplate.outerxml;       return request;     }     catch (exception ex)     {       throw ex;     }   }  public string send(string request)     {         try         {             string postdata = "";             string responsedata = "";             system.text.encoding encoding = system.text.encoding.getencoding("iso-8859-9");              postdata = "https://vpstest.bankasya.com.tr/iposnet/sposnet.aspx?prmstr=[data]";             postdata = postdata.replace("[data]", request);             httpwebrequest webreq = (httpwebrequest)webrequest.create(postdata);             webreq.timeout = convert.toint32(20000);             webreq.keepalive = false;             webreq.protocolversion = httpversion.version10;             webresponse webresp = webreq.getresponse();             stream respstream = webresp.getresponsestream();              byte[] buffer = new byte[10000];             int len = 0, r = 1;             while (r > 0)             {                 r = respstream.read(buffer, len, 10000 - len);                 len += r;             }             respstream.close();             responsedata = encoding.getstring(buffer, 0, len).replace("\r", "").replace("\n", "");             return responsedata;         }         catch (system.net.sockets.socketexception ex)         {             throw ex;         }         catch (webexception ex)         {             if (ex.status == webexceptionstatus.serverprotocolviolation)             {                 response.write("status code : {0} " + ((httpwebresponse)ex.response).statuscode);                 response.write("status description : {0} " + ((httpwebresponse)ex.response).statusdescription);             }             throw ex;         }         catch (exception ex)         {             throw ex;         }     }

which tried,

<httpruntime maxrequestlength="409600" executiontimeout="900"/> 
 <system.net>    <settings>      <httpwebrequest useunsafeheaderparsing="true" />    </settings>  </system.net> 
webreq.keepalive = false; webreq.protocolversion = httpversion.version10; webreq.timeout = 1000000000;  webreq.readwritetimeout = 1000000000;

note : there's test info's in code. not real values.

there error on bank's wcf systems. code working now.


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