How to bind XML data to the bar chart in windows phone application

Hi, I want to bind web service returned XML data to bar chart,
for this I wrote the following code but it shows the empty.
can anybody help me in this.
my code:
C#:
 XElement xmlNews = XElement.Parse(e.Result.ToString());
         
            ColumnSeries series = new ColumnSeries();
         
            series.SetBinding(ColumnSeries.ItemsSourceProperty, new Binding());
     
            series.ItemsSource = from item in xmlNews.Descendants("SyllabusDetails")
                                 select new Institute
                                 {
                                     Adress = item.Element("SubjectName").Value,
                                                             
                                     year = item.Element("ResultedMarks").Value
                                 };
        XAML: