Why data services? Common challenges when creating rich web applications Creating rich web applications with data services Future scenarios & roadmap

HTML + Javascript Data (XML, etc) DLL + XAML Data (XML, etc) Mashup UI Data Feeds AJAX Applications Silverlight Applications Online Services Mashups & Rich Clients

Leverage existing developer knowledge & code assets Provide rich, interactive, data-driven experiences Expressive, maintainable service contract Efficient network usage, minimize latency, … Secure data access Manage concurrent operations “But my data is …” Only accessible through stored procedures Not stored in a database 12345

What practices and assets can be reused when targeting data services? Uniform interface enables code reuse ADO.NET Data Services Framework client libraries & LINQ ASP.NET data source control 3 rd Party Control Vendors: data service aware controls Familiar programming paradigms

Service Operations Custom entry points, e.g. /CustomersByCity?city='Madrid' Eager/Lazy Loading of Related Entities $expand construct to pull the entire graph of data needed in one request Filtering & Paging Retrieve only the data needed, by pushing execution of filter expressions to the data source Batching Send set of CUD operations to the data service to be executed using “all or nothing” semantics

Can data services integrate with existing approaches for access control? Authentication Integrates with existing infrastructure ASP.NET Forms, HTTP, Live ID, Custom, etc Authorization Locked by default Infrastructure to express your authorization policy

If its just HTTP, what about concurrent operations? Supports optimistic concurrency Integrates with existing HTTP infrastructure GET /Customers(1) 200, ETag:xx PUT/Customers(1) If-Match: xx PUT/Customers(1) 201, ETag:xx OR 412, ETag:xx

“But my data is …” Create a data service backed by a DB using the ADO.NET Entity Framework Supports stored procedures Expose any other data source using a custom provider Data HTTP ADO.NET Data Service ADO.NET Entity Framework Custom Provider Any data source (DB, Web service, feed, file, etc)

Clients are not always “connected” How can we enable rich web clients experiences while offline? Store changes locally Synchronize local data with a data service when reconnected

A framework to create and consume REST-based data services Provides a rich service tier for consumption by web clients Roadmap Special “release” for MIX attendees on the conference CD ADO.NET Data Services Framework Beta 1 to come in a few weeks… AJAX & ASP.NET Data source to come after Exploring offline integration with data services

RESTful Data Services with the ADO.NET Data Services Framework Accessing Windows Live Services via AtomPub Using the Microsoft Sync Framework and FeedSync

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