ArcGIS API for SIlverlight 3.1 SIlverlight 5: identify task

[EssyJames]

ArcGIS API for SIlverlight 3.1 SIlverlight 5:  identify task

I have the following using statements:
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Geometry;
using ESRI.ArcGIS.Client.Printing;
using ESRI.ArcGIS.Client.Tasks;
using ESRI.ArcGIS.Client.Toolkit;
using ESRI.ArcGIS.Client.Toolkit.Primitives;

but I get an error in this line:

private List<DataItem> dataItems = null;

The type or namespace name 'DataItem' could not be found (are you missing a using directive or an assembly reference?

[DaveTimmins]

The DataItem class is just used to define your object to bind your data to the view. If you  look at the code for the identify sample in the interactive SDK http://resources.arcgis.com/en/help/silverlight-api/samples/start.htm#Identify the DataItem is defined at the bottom of the file

public class DataItem
        {
            public string Title { get; set; }
            public IDictionary<string, object> Data { get; set; }
        }

Cheers,