vb.net - Visual Studio 2012/Windows Phone 8 get results from Async Web Service -


so i'm working on windows phone 8 app (completely new windows phone 8 well) , i'm having trouble trying figure out how results asynchronous web service method right code tried fails , says "expression not produce value". here's code tried: 

'get previous date dim pdate datetime pdate = datetime.today.adddays(-1) dim previousdate string = pdate.tostring("d")  dim service new mobileservice.mobileservicesoapclient dim results new list(of string)() results.addrange(service.geterrortableasync(deviceidasstring, previousdate))

so geterrortable web service returns xml set of results , ios app can parse xml file create array of values (if exist) can't seem find consistent answer on how same windows phone/vb. guides or tutorials helpful since have web services return large array of objects , return single value.

there should callback delegate function geterrortableasync , called geterrortablecomplete. add handler delegate. names might diff should close enough find them on service object.

addhandler service.geterrortablecomplete addressof geterrortablecompleted service.geterrortableasync(deviceidasstring, previousdate)   private sub geterrortablecompleted(sender object, e mobileservice.geterrortablecompleteeventargs)   'now can access e.results end sub

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