This document discusses Entity Framework 4.1's "Code First" and DbContext approaches. It introduces ORM concepts and Microsoft's ORM options like LinqToSQL and Entity Framework. It then covers the different EF approaches of Database First, Model First, and Code First. Code First allows coding against POCO classes without needing to generate an EDMX file. The document demonstrates Code First and DbContext features and provides resources for further information.

1. Entity Framework 4.1 “Code First” & DbContext Omar Qadan twitter.com/omarq

2. What Is ORM

3. ORM’s in .NET World Some Open Source SubSonic Nhibernate … Some Commercial And the majority waiting microsft

4. Microsoft Answer LinqToSQL Entity Framework Persistence Ignorance ??

5. EF Approaches Database First Model First Code First

6. Database First Existing Database / DBA Maximum control Full T4 Template support (Self Tracking etc.) Not great with large models (50+ tables) Source Control merging headaches (XML)

7. Model First Generate Database / Migrate Like to “Draw” model / Designer Fan Less database centric Full T4 Template support Source Control merging nightmare (XML)

8. Code First Code Oriented / Dumb down DB No automated migration support (vNext) No T4 Template support / Self Tracking (yet) Source Control Branch friendly Cross EDMX easy No SP’s, Compiled Queries

9. Should have been V1 Simplifies Discoverability Does not replace Needed backward compatibility Wraps ObjectContext ObjectContext accessible DbContext DbSet ObjectContext ObjectSet Entity Client Conceptual / Mapping / Logical DbContext & DbSet Recommended for all approaches Use ObjectContext only when needed.

10. Features Fluent API COC DBContext API

11. Demo

12. Wrapup / Questions

13. Resources You can find Slides for EF4.1 Code First and DB Context here http://www.slideshare.net/omarq/entity-framework41codefirst and the code is here http://msdn.microsoft.com/en-us/data/gg685467 Entity Framework Videos http://msdn.microsoft.com/en-us/data/cc300162 Nuget.org the NuGet Package Manager Elmahhttp://code.google.com/p/elmah/ Glimpse http://getglimpse.com/ Nerddinner reloaded http://weblogs.asp.net/scottgu/archive/2010/07/16/code-first-development-with-entity-framework-4.aspx Microsoft Web Platform Installer http://www.microsoft.com/web/downloads/platform.aspx