c# - HttpWebResponse error, not found -

i have strange issue using httpwebrequest, i'm trying post string service httpwebresponse keeps producing following error;

"system.net.webexception: remote server returned error: notfound. ---> system.net.webexception: remote server returned error: notfound.   @ system.net.browser.clienthttpwebrequest.internalendgetresponse(iasyncresult asyncresult)\r\n   @ system.net.browser.clienthttpwebrequest.<>c__displayclass2.<endgetresponse>b__1(object sendstate)\r\n   @ system.net.browser.asynchelper.<>c__displayclass4.<beginonui>b__1(object sendstate)\r\n   @ system.reflection.runtimemethodinfo.internalinvoke(runtimemethodinfo rtmi, object obj, bindingflags invokeattr, binder binder, object parameters, cultureinfo culture, boolean isbinderdefault, assembly caller, boolean verifyaccess, stackcrawlmark& stackmark)\r\n   @ system.reflection.runtimemethodinfo.internalinvoke(object obj, bindingflags invokeattr, binder binder, object[] parameters, cultureinfo culture, stackcrawlmark& stackmark)\r\n   @ system.reflection.methodbase.invoke(object obj, object[] parameters)\r\n   @ system.delegate.dynamicinvokeone(object[] args)\r\n   @ system.multicastdelegate.dynamicinvokeimpl(object[] args)\r\n   @ system.delegate.dynamicinvoke(object[] args)\r\n   @ system.windows.threading.dispatcher.<>c__displayclass4.<fastinvoke>b__3()\r\n   @ system.reflection.runtimemethodinfo.internalinvoke(runtimemethodinfo rtmi, object obj, bindingflags invokeattr, binder binder, object parameters, cultureinfo culture, boolean isbinderdefault, assembly caller, boolean verifyaccess, stackcrawlmark& stackmark)\r\n   @ system.reflection.runtimemethodinfo.internalinvoke(object obj, bindingflags invokeattr, binder binder, object[] parameters, cultureinfo culture, stackcrawlmark& stackmark)\r\n   @ system.reflection.methodbase.invoke(object obj, object[] parameters)\r\n   @ system.delegate.dynamicinvokeone(object[] args)\r\n   @ system.multicastdelegate.dynamicinvokeimpl(object[] args)\r\n   @ system.delegate.dynamicinvoke(object[] args)\r\n   @ system.windows.threading.dispatcheroperation.invoke()\r\n   @ system.windows.threading.dispatcher.dispatch(dispatcherpriority priority)\r\n   @ system.windows.threading.dispatcher.oninvoke(object context)\r\n   @ system.windows.hosting.callbackcookie.invoke(object[] args)\r\n   @ system.windows.hosting.delegatewrapper.internalinvoke(object[] args)\r\n   @ system.windows.runtimehost.managedhost.invokedelegate(intptr phandle, int32 nparamcount, scriptparam[] pparams, scriptparam& presult)\r\n\r\n   @ system.net.browser.asynchelper.beginonui(sendorpostcallback beginmethod, object state)\r\n   @ system.net.browser.clienthttpwebrequest.endgetresponse(iasyncresult asyncresult)\r\n   @ zabbixclient.mainpage.responsecallback(iasyncresult result)\r\n   @ system.net.browser.clienthttpwebrequest.<>c__displayclassa.<invokegetresponsecallback>b__8(object state2)\r\n   @ system.threading.threadpool.workitem.dowork(object o)\r\n   @ system.threading.timer.ring()\r\n" 

my code looks like;

 private void btnsignin_click(object sender, routedeventargs e)     {         // prepare web request...         httpwebrequest myrequest = (httpwebrequest)webrequest.create(new uri("http://monitor.co.uk", urikind.absolute));         myrequest.method = "post";         myrequest.contenttype = "application/x-www-form-urlencoded";         myrequest.begingetrequeststream(new asynccallback(requestcallback), myrequest);     }  void requestcallback(iasyncresult result) {         httpwebrequest myrequest = result.asyncstate httpwebrequest;          //need error checking part         stream stream = myrequest.endgetrequeststream(result);      using (streamwriter sw = new streamwriter(stream)){          sw.write("{ \"jsonrpc\":\"2.0\",\"method\":\"user.authenticate\",\"params\":{\"user\":\"<login>\",\"password\":\"<password>\"},\"id\":2}");     }     myrequest.begingetresponse(responsecallback, myrequest);     }  void responsecallback(iasyncresult result)     {         //get request object         httpwebrequest myrequest = result.asyncstate httpwebrequest;         try         {             //need error checking here             httpwebresponse response = myrequest.endgetresponse(result)                 httpwebresponse;             using (streamreader sr = new streamreader(response.getresponsestream()))             {                 system.windows.deployment.current.dispatcher.begininvoke(() => { messagebox.show(sr.readtoend()); });             }         }         catch (webexception webexcp)         {             system.windows.deployment.current.dispatcher.begininvoke(() => { messagebox.show(webexcp.tostring()); });         }     } 

i can't figure out what's going on, url specified correctly , working, read use fiddle monitor going on nothing appears in fiddler suggesting it's not getting make request? info appreciated. thanks!

first, let me point out problem in code:

using (streamreader sr = new streamreader(response.getresponsestream())) {    system.windows.deployment.current.dispatcher.begininvoke(() => { messagebox.show(sr.readtoend()); }); } 

the stream closed time attempt display result. should have this:

using (streamreader sr = new streamreader(response.getresponsestream())) {     string s = sr.readtoend();     system.windows.deployment.current.dispatcher.begininvoke(() => { messagebox.show(s); }); } 

yet, not sure why want display response in messagebox instance - unreadable - use output console debugging purposes.

back on topic - notfound returned server , has nothing request being processed os. generic error , need make sure invoking supported on other end.

make sure have internet connection (on side note).