(ArcGIS API for Silverlight) Querytask queries across layers and monitors the completion of queries!

(ArcGIS API for Silverlight) Querytask queries across layers and monitors the completion of queries!
Directly on the source:

<summary>///Querytask query multiple layers and bind data///</summary>//<param name= "listURL" > Layers URL collection </param>///<param Name= "strSQL" > Layer query sql</param> private void Querybymultiurl (LIST&L T;string> listURL, String strSQL) {if (strsql== "") {MessageBox.Show ("Please enter sieve Select a condition!                ");            Return            } loadingmask.loadmask ();            Inturlcount = Listurl.count; if (index = = 0) xmfwxgraphiclist.clear ();                    Empty xmfwxgraphiclist if (inturlcount! = 0) {string url = Listurl[index];                    Querytask querytask = new Querytask (URL);                    querytask.failed + = querytask_allfailed;                    Query query = new query (); Query.                    Returngeometry = true; Query.                    Where = strSQL; Query.                    Outfields.add ("*"); Querytask.executeasync (Query); querytask.executecompleted + = (sender2, args2) = {Querytask Objquer                            Ytask = Sender2 as Querytask;                            FeatureSet pfeatureset = Objquerytask.lastresult; foreach (Graphic item in Pfeatureset) {Xmfwxgraphiclist.add (ite                            m);                            } index++;                        Queryfun (Listurl,strsql);            }; }        }

(ArcGIS API for Silverlight) Querytask queries across layers and monitors the completion of queries!