This document summarizes Language Integrated Query (LINQ) and its capabilities in Microsoft technologies. It discusses how LINQ brings query capabilities to programming languages like VB and C#, and what data sources LINQ can query, including SQL, XML, objects, and entities. It also provides an overview of LINQ's implementation in .NET Framework 3.5 and future versions, allowing querying of data from SQL Server, Oracle, and other sources.

1. Language Integrated Query Mike Taulty Developer & Platform Group Microsoft Ltd [email_address] http://www.mtaulty.com

2. Agenda Why LINQ? How are query capabilities added to the languages? What is LINQ enabled in VS2008 & Fx 3.5? What is LINQ enabled after VS2008?

3. Why do we need LINQ? My Code “ API”  SQL XML Query As String Loosely typed result Objects

4. Language Integrated Query

5. LINQ brings us closer to data

6. LINQ in the Languages Many new language features in VB9 & C# 3 VB9 XML Literals Relaxed Delegates C# 3.0 Extension Methods Object Initialisers Anonymous Types Implicit Typing Lambdas Collection Initialisers Partial Methods Automatic Properties

7. LINQ in the Languages Some are enablers for LINQ VB9 C# 3.0 Collection Initialisers Partial Methods Automatic Properties

8. LINQ Language Features

9. Query Pattern -> Language Features

10. Query Pattern -> Language Features Compiler looks for extension methods which extend IEnumerable<T> IQueryable<T>

11. IEnumerable<T> & IQueryable<T> IEnumerable – query executed piece by piece IQueryable – query executed in one go where select Capture & Execute Execute Execute where select

12. LINQ in VS2008 & Fx 3.5

13. LINQ to SQL, XML and DataSet

14. Beyond VS 2008 – ADO.NET V3.0 DataStore (SQL, Oracle, etc) ADO.NET Provider (e.g. SqlClient, OracleClient, etc) ADO.NET V2.0 ADO.NET Entity Provider (EntityClient) Conceptual Data Model Query with LINQ to Entities, Entity SQL ADO.NET V3.0 & Entity Framework

15. LINQ to Entities

16. Summary LINQ plumbed into VB9 and C#3.0 Languages Lots of other language features too LINQ enabled in .NET Framework V3.5 Objects, SQL, XML, DataSet LINQ enabled post .NET Framework V3.5 Entities ...

17. Resources http://msdn.microsoft.com/vstudio MSDN LINQ Developer Centre http://tinyurl.com/3e2qpo ADO.NET Team Blog http://blogs.msdn.com/adonet

18. MSDN in the UK Visit http://msdn.co.uk Newsletter Events Nugget Videos Blogs