The Entity Framework and ASP.NET – Getting Started Part 1http://www.asp.netThu, 21 Apr 2011 19:11:16 GMTumbracoComments for The Entity Framework and ASP.NET – Getting Started Part 1enComment Posted by felixrmelendezhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Thu, 09 Dec 2010 21:47:20 GMT00000000-0000-0000-0000000011165Are these tutorials be available in PDF format?

]]>Comment Posted by larry2008http://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Sat, 11 Dec 2010 00:35:56 GMT00000000-0000-0000-0000000011175I received an error from VS 2010 Professional Eval edition regarding the connection to the database. I do not have SQLEXPRESS installed, but do have SQL Server 2008 R2 installed. Even though the error was produced, I was able to get the SchoolModel created?

]]>Comment Posted by Spikehhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Tue, 14 Dec 2010 09:06:35 GMT00000000-0000-0000-0000000011193Looks like a graphical representation of something I'm working on myself at the moment!

]]>Comment Posted by tanorhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Sun, 19 Dec 2010 03:53:48 GMT00000000-0000-0000-0000000011246super teşekkürler çok başarılı bir çalışma olmuş.

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Tue, 21 Dec 2010 16:39:09 GMT00000000-0000-0000-0000000011265@felixmelendez,

Sorry for delayed response, I thought I had posted a response earlier but I don't see it now. There are no plans at the moment to create a .pdf version but we will reconsider if there is sufficient demand.

@larry2008

For help with connection problems, try the SQL forum - forums.asp.net/

]]>Comment Posted by sramehhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Thu, 23 Dec 2010 09:55:30 GMT00000000-0000-0000-0000000011291Can somebody fix the broken links for the "Next Tutorial"?

I get an error page.

www.asp.net/

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Mon, 27 Dec 2010 15:02:09 GMT00000000-0000-0000-0000000011322The links appear to be working now -- are they still now working for you?

]]>Comment Posted by picapauhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Mon, 03 Jan 2011 06:35:23 GMT00000000-0000-0000-0000000011400Congratulations! It's the best sample I've ever got.

In Part 5 you show how to assign Instructors to Courses. Is it possible to assign an Instructor in the same moment I'm adding a Course like I do with Departament, that's using a DropDownList? The difference is that in the Instructor case is a many-to-many relation and for the Departament is a One-to-many. It will be great if you add a code sample.

Thank you again very much for your extraordinary good sample!!!

]]>Comment Posted by shabirhakim1http://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Wed, 12 Jan 2011 11:47:16 GMT00000000-0000-0000-0000000011490Hi,

Beautiful explanation.I love it

Regards

Shabir Hakim

]]>Comment Posted by muhammedhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Thu, 13 Jan 2011 05:34:25 GMT00000000-0000-0000-0000000011498Hi,

Are these tutorial also available in pdf

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Fri, 14 Jan 2011 13:50:56 GMT00000000-0000-0000-0000000011530@picpau

If you're just assigning one instructor, the code would be just like what you see in the departments page. For multiple instructors you might use check boxes or a multi-select list, but the code to establish the relationship is still the same, you're just adding several entities to the collection instead of one. I am starting on the MVC tutorial and will see if I can integrate this scenario into it, though that would be using a Web Forms databound control.

@muhammed

Sorry, at this time there are no plans to create a .pdf version.

]]>Comment Posted by eswargondihttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Sun, 23 Jan 2011 04:04:07 GMT00000000-0000-0000-0000000011718Well explained.

]]>Comment Posted by chandradev1http://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Fri, 28 Jan 2011 00:11:02 GMT00000000-0000-0000-0000000011807Really very nice explanation.

]]>Comment Posted by kamran_saeedihttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Fri, 28 Jan 2011 17:07:05 GMT00000000-0000-0000-0000000011826It would be great to have these tutorials in PDF too.

]]>Comment Posted by kamran_saeedihttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Fri, 28 Jan 2011 17:10:19 GMT00000000-0000-0000-0000000011827+ If there is a particular reason not to create and present tutorials in PDF, please let us know.

Regards

]]>Comment Posted by asadazmathttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Mon, 31 Jan 2011 05:11:14 GMT00000000-0000-0000-0000000011869Good tutorial for those who are new to Entity Framework model.

]]>Comment Posted by jodanalsistemahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Mon, 07 Feb 2011 18:00:03 GMT00000000-0000-0000-0000000011957where you say "the Courses property in a Person entity contains a collection of all the Course entities that are related to that Person entity." are you not meaning to say " contains a collection of all the Course PROPERTIES" instead ? Otherwise I dont understand, how many Course entities can there be but one ?

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Mon, 07 Feb 2011 20:13:18 GMT00000000-0000-0000-0000000011960@jodanalsistema

The way the database is set up, an instructor may teach multiple courses. The person entity representing an instructor has only one Course property, but that property contains a collection of Course entities, each entity representing one course (one row from the Course table) that the instructor is associated with. This becomes a little clearer in one of the later tutorials where a page assigns and unassigns instructors from courses.

@kamran and Mark

A .pdf is now available on the CodePlex site and there's a link to it at the top of this page, sorry for the delay.

]]>Comment Posted by jodanalsistemahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Tue, 08 Feb 2011 10:38:58 GMT00000000-0000-0000-0000000011974From my Oracle classes at Harvard back in my 2002 year, professor Pappadopoulos:

• An entity is an absolute concept, a person, place, thing, event, idea, etc.

• An attribute is information about some property of an entity

With this in mind, we constructed the ERA (Entity Relationship Analysis) . I am seeing 7 actual entities and 1 association table in the first example. I read everything about ADO on msd library and they break apart the concept of RDBMS by constructing other entity concepts in order to make the JOIN queries much simpler, yet, the construction of normalized tables was very logical and clear in the "old" RDBMS. With ADO I am not seeing it so clearly. I can always drag the entitydatasource from the toolbox, yet ....

As I am seeing they are hauling both the student and the instructors onto a single table but that way they are unavoidably creating null values for example the HireDate, values which are always going to be null for students, neither does enrollment date make any sense for instructors, so that is not correctly designed. You can leave values if as of a date the value is not yet known, but not knowing from the start that you are always going to leave it blank. The fact that you need to double describe an entity as you did "person instructor, person student" does not speak for a clear design.

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Wed, 09 Feb 2011 20:00:03 GMT00000000-0000-0000-0000000011993@jodanalsistema

The inheritance structure is explained better in the tutorial on inheritance, and that tutorial also provides links to further information about inheritance schemes. Properties like HireDate which are significant only for some entity types and not others are typical of the table-per-hierarchy inheritance scheme. An alternative is to use the table-per-type inheritance scheme, which is explained in the inheritance tutorial, but there is not an example of it in this series.

]]>Comment Posted by kamran_saeedihttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Sun, 13 Feb 2011 19:20:28 GMT00000000-0000-0000-0000000012038Thanks a lot for PDFs.

]]>Comment Posted by inspectrheckhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Wed, 23 Mar 2011 22:27:17 GMT00000000-0000-0000-0000000012585In the introduction of this tutorial you indicated that the downloaded files have the VB version. However is it possible to get the tutorial in the step by step version you've presented in these tutorials in VB which you do have in the MVC framework tutorials. Its harder to follow step by step when viewing the completed versions.

]]>Comment Posted by xtomicinoxhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Wed, 13 Apr 2011 16:56:05 GMT00000000-0000-0000-0000000012789VB.NET sample download

Could not load type 'ContosoUniversity.DAL.SchoolEntities'

I've tried looking into why, I'm building the project from scratch (following the C# tutorial) - I noticed that the VB.net download does not use the DAL namespace. I would like to. Could you please advise? I looked in the forums, but couldn't find what I needed.

Thanks

Tommy

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Thu, 21 Apr 2011 18:53:29 GMT00000000-0000-0000-0000000012923@xtomicinox - VB uses namespaces differently from C# in that it prefaces everything with the default namespace. If you enter namespaces the same way as c#, your SchoolEntities class my have ended up in ContosoUniversity.ContosoUniversity.DAL namespace.

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-1Thu, 21 Apr 2011 19:11:16 GMT00000000-0000-0000-0000000012925@inspectrheck - We don't have plans at present to create a VB version of the EF tutorials. If there's a spot where you have a question, you can ask here or in the forum that's linked to at the top. I'm late getting responding here because I wasn't getting an RSS feed I thought I was getting. Working on getting that fixed.

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