c# - How to show loading message while making a json request on windows phone? -

i need show loading message, while json request made on windows phone, async task progressdialog on android, put dialog.show() on onpreexecute() , dialog.dismiss() on onpostexecute. how can on windows phone?

here json request:

webclient webclient = new webclient();     webclient.downloadstringcompleted += new downloadstringcompletedeventhandler(webclient_downloadstringcompleted);     webclient.downloadstringasync(new uri("https://maps.googleapis.com/maps/api/place/textsearch/json?&query=taxi&location=-19.94549444,-43.92314218&&radius=5000&sensor=true&key=aizasyducc8qbv5wu4v-dqxffabxgaauzdmt5xw")); 

while request downloading, need show loading message, , ent when request complete.

you can display progress bar indicate ongoing process.
put code follows:

webclient webclient = new webclient(); webclient.downloadstringcompleted += new downloadstringcompletedeventhandler(webclient_downloadstringcompleted);  progressindicator progressindicator = new progressindicator() {     isvisible = true,     isindeterminate = false,     text = "loading..."  };  systemtray.setprogressindicator(this, progressindicator); webclient.downloadstringasync(new uri("https://maps.googleapis.com/maps/api/place/textsearch/json?&query=taxi&location=-19.94549444,-43.92314218&&radius=5000&sensor=true&key=aizasyducc8qbv5wu4v-dqxffabxgaauzdmt5xw")); 

this display progress bar request begin execute.
stop after load, add following code event handler:

void webclient_downloadstringcompleted(s, e) {     dispatcher.begininvoke( () =>     {         progressindicator.isvisible = false;         // code     }); }