The WCF EF 4.1 not updating the data in datatable

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WCF

I have successfully installed the WPF rad control in my machine.And bind the rad grid view with the RadDataServiceDataSource .It is working fine but when click in a cell and update the content in it .

Here is the xaml part present

The WCF Service i used is this..

public class Baazaar : DataService<ObjectContext>
{
   // This method is called only once to initialize service-wide policies.
   public static void InitializeService(DataServiceConfiguration config)
   {
      config.SetEntitySetAccessRule("*", EntitySetRights.All);
      config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
   }
   protected override ObjectContext CreateDataSource()
   {
      BaazaarDbContext nw = new BaazaarDbContext();

      // Configure DbContext before we provide it to the
      // data services runtime.
      nw.Configuration.ValidateOnSaveEnabled = false;

      // Get the underlying ObjectContext for the DbContext.
      var context = ((IObjectContextAdapter)nw).ObjectContext;

      // Return the underlying context.
      return context;
}
}

And in the delete button i have past the code is..

private void cmdDelete_Click(object sender, RoutedEventArgs e)
{

   //DataGridRow drg = (DataGridRow)grdDetails.SelectedItem;

   //if (drg != null)
   //{
   // drg.FindName("");
   //}

   MyBaazaarContext cxnt = new MyBaazaarContext();
   Currency cur = new Currency();

   cur.ThreeLetterIsoCode = "Deve";

   cxnt.AddToCurrency(cur);

   //radDataServiceDataSource1.DataContext= grdDetails.DataContext;

   //radDataServiceDataSource1.SubmitChanges();

   //radDataServiceDataSource1.SubmitChanges()

   // radDataServiceDataSource1.sub
}

It shows me the error...

An error occurred while processing.

Please help me in this regard as I am unable to tun your demo application as it is required ADO.NET 3.5 support.

Thanks in advance
Soumesh