In WPF/Silverlight, binding UI objects such as DataGrid or ListBox to collections is typically done using an ObservableCollection instead of the generic List object. This way, our UI is automatically synchronized since the observable collection provides event notification to WPF data binding engine whenever items are added, removed, or when the whole list is refreshed. The LINQ extension methods that return a collection actually return IEnumerable<T>. The .NET framework for Silverlight provides built-in extension methods to convert IEnumerable<T> to List<T> and Array<T> but there’s no method available to convert the collection to ObservableCollection<T>(WPF developers can simply use this constructor overload) . So here’s one you may find useful:

public static class CollectionExtensions
    public static ObservableCollection<T> ToObservableCollection<T>(this IEnumerable<T> enumerableList)
        if (enumerableList != null)
            //create an emtpy observable collection object
            var observableCollection = new ObservableCollection<T>();

            //loop through all the records and add to observable collection object
            foreach (var item in enumerableList)

            //return the populated observable collection
            return observableCollection;
        return null;

Extension methods are very powerful and I am planning to post an example demonstrating their potential.


Silverlight article posted at CodeProject

At last, I was able to complete and post my article: “My First Data Application in Silverlight” at CodeProject here:
This one is a detailed article intended for beginners starting Silverlight. It discusses how data from a database can be retrieved and displayed in a silverlight application. It discusses how LINQ objects are returned using a WCF service and consumed in a silverlight application. On the layout side, it looks at the ListBox and DataGrid and provides an introduction to the data templates too. I think that most of the silverlight programmers have past experience of ASP.NET so I also discussed the similarities between ASP.NET and Silverlight. I hope people will find this article beneficial.