C#-Facebook-SDK WP7, the principles of how Facebook works? -

apologies if somewhere, i'm struggling find details need wp7.

i have created application on facebook required, , retrieving access token. following code posts facebook cannot response, nor can work out how monitor response?

public bool fbupload(string accesstoken, picture pic)     {         try         {             stream s = null;             s = picturesloader.loadfilefromstorage(pic.url);              //sets byte array correct number of bytes             byte[] imagedata = new byte[s.length];              s.read(imagedata, 0, system.convert.toint32(s.length));              facebookapp app = new facebookapp();             idictionary<string, object> parameters = new dictionary<string, object>();             parameters.add("access_token", accesstoken);             parameters.add("message", "test - wp7 application [upload pic , comment on wall...]");             var mediaobject = new facebookmediaobject { filename = pic.name, contenttype = "image/jpeg" };             mediaobject.setvalue(imagedata);              parameters["source"] = mediaobject;             facebookasyncresult postresult;             facebookasynccallback fbcb = new facebookasynccallback();             app.postasync(parameters, fbcb);        return true;         }         catch (invalidcastexception ex)         {             return false;         }     } 

the other question have, how allow users allow access based upon own facebook account. want store user's account details have set account details once, , can use phone app having sign in?

you can handle post result this:

facebookasynccallback callback = new facebookasynccallback(postresult); fbapp.postasync(parameters, args, callback);    private void postresult(facebookasyncresult asyncresult)    {   // asyncresult here; } 

regarding second question, must ask permissions access data. in facebookoauthclient.getloginurl(<appid>, null, <permissions>) method call.
once that's done, can store files have permissions locally in app.