The Entity Framework and ASP.NET – Getting Started Part 2http://www.asp.netSun, 28 Aug 2011 18:09:46 GMTumbracoComments for The Entity Framework and ASP.NET – Getting Started Part 2enComment Posted by boxershttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Fri, 31 Dec 2010 07:00:49 GMT00000000-0000-0000-0000000011372Am getting Could not load type 'ContosoUniversity.DAL.SchoolEntities'

Really not sure on this one at all !! any clues anyone ?

Mike

]]>Comment Posted by boxershttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Fri, 31 Dec 2010 07:27:45 GMT00000000-0000-0000-0000000011373checked on source...

changed from 'ContosoUniversity.DAL.SchoolEntities' to 'ContosoUniversity.SchoolEntities'

problem resolved

hope this helps someone from a wasted hour! :)

]]>Comment Posted by yumyum113http://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Thu, 13 Jan 2011 16:05:18 GMT00000000-0000-0000-0000000011508It did saved me some time, thanks for sharing. How did you come up with the right value, I'm thinking it would help for future references :)

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Sun, 16 Jan 2011 10:50:44 GMT00000000-0000-0000-0000000011556If the .edmx is in the DAL folder, the namespace should include DAL by default, as it does in the downloadable sample project. If anyone does have the .edmx in the DAL folder but isn't getting that default namespace value, I would appreciate hearing more about why that is happening, so I can correct the tutorial.

]]>Comment Posted by rtpHarryhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Wed, 26 Jan 2011 10:18:14 GMT00000000-0000-0000-0000000011771@tdykstra - My guess would be they created the edmx in the wrong place and then dragged it over to the DAL folder.

]]>Comment Posted by evtlucashttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Wed, 26 Jan 2011 17:44:53 GMT00000000-0000-0000-0000000011785When I tried to include the column StudentGrades.Count, i got the error System.Web.UI.WebControls.EntityDataSourceWrapper which told me that StudentGrades

]]>Comment Posted by evtlucashttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Wed, 26 Jan 2011 17:46:00 GMT00000000-0000-0000-0000000011786When I tried to include the column StudentGrades.Count, i got the error System.Web.UI.WebControls.EntityDataSourceWrapper which told me that StudentGrades doesn't exist. How can I figure out this issue?

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Wed, 26 Jan 2011 20:09:47 GMT00000000-0000-0000-0000000011789@evtlucas

Please post your question to the EF forum (see the link at the top of the tutorial) along with some more information about the error. I'll take a look and if I can't figure it out maybe someone else can.

]]>Comment Posted by asadazmathttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Mon, 31 Jan 2011 05:12:17 GMT00000000-0000-0000-0000000011870Every tutorial deserves 10/10.

]]>Comment Posted by kamran_saeedihttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Sun, 13 Feb 2011 19:01:05 GMT00000000-0000-0000-0000000012037While trying "Adding and Configuring the EntityDataSource Control" section in this tutorial, I got a run-time error as follows:

"The defined query has a polymorphic or abstract return type. Define EntityTypeFilter to restrict the query to a single concrete type."

The author must have forgotten to mention that "EntityTypeFilter" should be set to either "Student" or "Instructor". Am I right?

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Mon, 14 Feb 2011 14:51:55 GMT00000000-0000-0000-0000000012049Is it possible you did parts of a later tutorial before this one, or are working with downloaded code which has code from a later tutorial? At this point in the tutorial it should not be necssary to set the entity type filter because Student and Instructor entities don't exist yet, only Person entities.

]]>Comment Posted by kamran_saeedihttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Sat, 19 Feb 2011 05:43:40 GMT00000000-0000-0000-0000000012137Yes tdykstra, I did parts of a later tutorial before this one.

Thanks a lot.

]]>Comment Posted by thuffhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Sat, 19 Feb 2011 10:56:48 GMT00000000-0000-0000-0000000012141I am having a problem when I try to refresh schema - it reads Could not find the CLR type for 'SchoolModel.Person' Please help!

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Tue, 22 Feb 2011 23:32:45 GMT00000000-0000-0000-0000000012188If you have already switched the data source control over to ContextTypeName, refresh schema won't work -- that might cause this error.

]]>Comment Posted by arian283http://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Thu, 24 Feb 2011 22:46:01 GMT00000000-0000-0000-0000000012226FYI 

I have same problem with DAL.SchoolEntities dispid of having .edmx in the DAL.

]]>Comment Posted by anakopiahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Mon, 14 Mar 2011 04:49:12 GMT00000000-0000-0000-0000000012453I have the .edmx in the App_Code folder and getting Could not load type 'ContosoUniversity.App_Code.SchoolEntities' error.

Please help!

]]>Comment Posted by tashfin.wahidhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Tue, 12 Apr 2011 17:46:28 GMT00000000-0000-0000-0000000012771Thanks boxers. That was extremely helpful.

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Thu, 21 Apr 2011 19:01:34 GMT00000000-0000-0000-0000000012924@anakopia - The easiest solution to having the .edmx in App_Code would be to delete it from there and re-create it in the DAL folder.

]]>Comment Posted by davidicodehttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Fri, 27 May 2011 15:00:10 GMT00000000-0000-0000-0000000013293When adding the "SchoolEntities" EntityDataSource Control, I continue to receive the error above "unable to load the specified metadata resource" after rebuilding the project.

I don't understand why this tutorial doesn't work as written.

I'm using Windows 7 professional, 64 bit with Visual Studio 2010 Professional SP1.

When I download the source code and compile the page "Students.aspx" runs.

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Tue, 31 May 2011 11:17:31 GMT00000000-0000-0000-0000000013338@davidicode - The only time I have seen that error is when the project needed to be built. Since the downloadable project works, I suggest using a source code compare tool to find out if there are any differences between the files (including the .edmx) in the project you built from the tutorial and the one in the downloadable project.

]]>Comment Posted by ShaunLuttinhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Fri, 03 Jun 2011 19:03:06 GMT00000000-0000-0000-0000000013386This tutorial was both clear and motivating. Hooray for Microsoft.

]]>Comment Posted by hareshambaliyahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Thu, 21 Jul 2011 12:48:59 GMT00000000-0000-0000-0000000013806love it, courteous

]]>Comment Posted by mooremediahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Tue, 09 Aug 2011 15:43:01 GMT00000000-0000-0000-0000000013940Regarding "Database Rules to Allow Deletion" - why do we only need to configure 1 of the 3 relationships (for cascade deletes) that the "Person" table has. If a Person is deleted, won't you need to allow deletions of their OfficeAsignment and Course AS well?

]]>Comment Posted by tdykstrahttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Tue, 23 Aug 2011 14:38:09 GMT00000000-0000-0000-0000000014019The other relationships are only for instructors; Student rows in the Person table would only have related data in the StudentGrade table. The purpose here was just to ensure that you could delete students. If you were building CRUD pages for instructors you might decide to add cascade delete to the other relationships, or you might decide that it would be better to force the deletions of related data to be done manually before deleting an instructor.

]]>Comment Posted by RonnyJhttp://www.asp.net/web-forms/tutorials/getting-started-with-ef/the-entity-framework-and-aspnet-getting-started-part-2Sun, 28 Aug 2011 18:09:46 GMT00000000-0000-0000-0000000014067I also continued to receive "unable to load the specified metadata resource" even after building the project. I noticed that when answering "No" to putting the file in AppCode the SchooModel.Designer.cs was never created. Maybe this is part of the problem?

Finally, after comparing code in the web.config file and the folder structure of the full project, I accepted putting the file into the AppCode folder and everything works fine. I tried moving the SchoolModel.edmx to the DAL folder after it was created in App_Code, but that didn't work.

Hopefully this doesn't throw me off too much in the next lessons that this isn't in the right directory.

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