Data not loading in Silvelight + EF

//I have the following methods. I want to query a table data by using the output i got from previous query. I tried the below code but data does not load.

private void btnFetch_Click(object sender, RoutedEventArgs e)
        {
            ctx = new Context();
//Data loads here
            ctx.Load(ctx.GetQuery()).Completed += new EventHandler(Report_Completed);
        }

        void Report_Completed(object sender, EventArgs e)
        {
int foundryId=1;
//Data loads here
            ctx.Load(ctx.GetReportQuery(foundryId, (DateTime)fromDatePicker.SelectedDate,
                (DateTime)toDatePicker.SelectedDate)).Completed += loadCompleted;
        }

private void loadCompleted(object sender, EventArgs e)
        {

if (ctx.IsLoading) return;
           var report = ((LoadOperation<FilmConsumptionReportRow>)sender).Entities;

foreach (var r in report)
            {

//I am trying to load the data here. But data is null.
ctxForPreviousREport = new RadiographyContext();                   ctxForPreviousREport.Load(ctxForPreviousREport.GetRGReportsOnRtNoAndReshootNoQuery(r.RTNo, r.ReshootNo));
                    RGReport rGReport = ctxForPreviousREport.RGReports.FirstOrDefault();
}
}