The DataPage model, assuming it is what was presented here, is a potential solution yet I am wondering what can be done with EntityQueries in WCF RIA.  You have another presentation that I would like to see expanded upon to show how to better deal with the server processing vs silverlight client and paging, while using EntityQueries and VirtualCollections. 

Now whether the DataPage<T> response model should/could be combined with the RIA methods on the DomainService, and requests to page go to the service on each page.

Or do what I did and return the complete result set to a ViewModel and have the count done there by setting IncludeTotalCount = true on the initial EntityQuery and just use the VirtualCollection to handle the rendering of the prefectched data to the grid with linq.

I just would like to know your thoughts, hope I haven't confused matters.

Regards,

Adam

I'm checking if you have any more questions or concerns regarding the virtual collection.

Thanks,

Hi,
Let's use the VirtualCollection as a source for a grid.
The grid access the first page and the VirtualCollection requests data from the application.
The application can use a WCF service to request items from the server when VirtualCollection fires ItemsDataRequested.
The GetDataPage is a sample method that returns a data page:
  public DataPage GetDataPage(int startIndex, int count, ...)
The DataPage class has three properties:
  DataItems  - the records
  StartIndex - the index of first item that the VC requests
  DataCount  - the total number of items
In a DataPageCompleted eventhandler the application calls the LoadItems method:
  _virtualCollection.LoadItems(e.Result.StartIndex, e.Result.DataItems);
  if (e.Result.DataCount > -1)
  {
    // here the application can set the actual count
    _virtualCollection.AnticipatedCount = e.Result.DataCount;
  }
Hope this helps
Regars,
Marin