c# - How to get JSON data very fast from URL in windows phone 8.1 app? -

i developing 1 windows phone app.

in app getting json data service url , binding list box. and, in json data has 2500 cities. these cities came service , binding list box take 5 minutes time.

then how getting data fast service? please me.

below code:

 public async void insertcities()         {             try             {                   await this.dispatcher.runasync(windows.ui.core.coredispatcherpriority.normal, async () =>                 {                       var busclient = new newpavanapp.jsonwebclient();                      var busresp1 = await busclient.dorequestasync(url.weburl + "getcities");                     string busresult1 = busresp1.readtoend();                     jarray busjsonarray = jarray.parse(busresult1);                      (int j = 0; j < busjsonarray.count; j++)                     {                          jobject jobj = (jobject)busjsonarray[j];                          string id = (string)jobj["cityid"];                         string cityname = (string)jobj["cityname"];                            city cit = new city();                         cit.cityname = cityname;                          fromcityname1.items.add(cityname);                         tocityname1.items.add(cityname);                         db_helper.insert(new buscities(id, cityname));                         userprofilelist.add(cit);                          //  citieslist.add(cityname);                      }                    }); 

ok, first: code fragment isn't enough reproduce problem, think code getting data fine , have problem binding.

you wrote:

these cities came service , binding list box take 5 minutes time.

check, how time need download data without binding. because binding time-consuming operation. if try bind 2500 elements , don't use virtualization can problem on windows phone. try use listview virtualization (it can helpful).

@update (17:30 - 12.10.2015)

yes.its download data fast.but whenever binding data time taking time.then should do.please me.please give me sample.

ok, in opinion: shouldn't bind elements in same time. read incremental loading in listbox (load more items listbox when scrolled bottom). can download items, , add itemssource part of them, , after user scroll end load more.