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During the PDC release milestone of RIA Services, we discovered an error from DomainDataSource when using AutoLoad="True" and when using a DataPager bound to the DomainDataSource’s Data property.  We found that when the PageSize property is specified on the DataPager and not on the the DomainDataSource itself, an exception would often (but not always) be thrown from DomainDataSource, indicating that a load could not be invoked while another load was in progress.  The reason for this will actually interest you most if you use AutoLoad set to False.

Silverlight 3 includes PagedCollectionView class, which provides UI-level grouping, sorting and paging functionality for any data source that implements the IEnumerable interface. This works as long as all the data that you need to sort, page are already fetched to the client which could be a slow process and can potentially consumed lots of memory on the client-side. A better solution is to provide Server-side sorting & paging. 

As there is no support for multibinding, I inherited DataPager added few properties  and was able to get it to work.  you should be able to change the number of rows displayed by changing the value in the TextBox next to “Show Rows:”. 

Introduction

By now we have discussed the preparations around the project, how to add a DomainService that contains our business logic and combine it with the entity framework. If you have missed one of the previous articles you can find them here:

Creating applications with .NET RIA Services Part 1 - Introduction

Creating applications with .NET RIA Services Part 2 - Creating the project

Creating applications with .NET RIA Services Part 3 - Adding a DomainService class

As you know from the previous articles in order to demonstrate the features of the .NET RIA Services I am creating the Web Administration Tool from ASP.NET in Silverlight. In this article I am going to create the Manage Users page and add the functionality needed to visualize Data. For that purpose I will need the DataGrid control, the new DataPager control and the DomainDataSource that is a part of the .NET RIA Services framework.

Here is a link to the live demo at this stage and the source code. Note that they will be updated with each article! ;)