thefrozencoder

Programming and Technology blog

Type 'ContosoUniversity.DAL.Department' could not be found

So I was going through the tutorial Handling Concurrency with the Entity Framework in an ASP.NET MVC Application when I encountered this error on step 7 of 10.

Type 'ContosoUniversity.DAL.Department' could not be found. Make sure that the required schemas are loaded and that the namespaces are imported correctly. Near type name, line 1, column 132.

The error is thrown on the following line:

var databaseValues = (Department)entry.GetDatabaseValues().ToObject();

This error is due to a bug in EF 4.1 where you separate the DAL and Model Entities out into different namespaces and is referenced here EF4.1 CodeFirst - entry.GetDatabaseValues() throw EntitySqlException.

To fix this issue I came up with this workaround:

Replace the lines:

var databaseValues = (Department)entry.GetDatabaseValues().ToObject(); 
var clientValues = (Department)entry.Entity;

with the following lines:

var clientValues = (Department)entry.CurrentValues.Clone().ToObject();
entry.Reload();
var databaseValues = (Department)entry.CurrentValues.ToObject();

It seems to work ok for simple concurrency checks and it allows you to continue on with the tutorial.

Workaround for Installing KB Article KB971092 successfully

In some cases there is an issue with installing the following update “Security Update for Microsoft Visual Studio 2008 Service Pack 1 (KB971092)”.  The workaround to properly install the update you must set the security on the files vsvars32.bat and vcvarsall.bat to allow the local Users group write permission on those files.  I am not sure why this is an issue but from reading other posts and such on the issue most of the affected people do not have vc++ installed.

They can be found in the following folders:

x86

  • C:\Program Files\Microsoft Visual Studio 9.0\VC\vcvarsall.bat
  • C:\Program Files\Microsoft Visual Studio 9.0\Common7\Tools\vsvars32.bat

x64

  • C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\vcvarsall.bat
  • C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\Tools\vsvars32.bat

Run As Administrator Shortcut

When developing using Visual Studio (VS) Microsoft recomends that you run VS with elevated permissions for debugging, for the most cases you really don’t need to do this but if you want to make it easier on yourself you can force VS to elevated permissions on the shortcut.  Just right click on the shortcut and select Properties from the context menu then select the Compatibility Tab and check off the Run As Administrator check box as seen below.  Now you probably want to turn off the UAC feature with this as well, this guide shows a few ways to do this.

That’s it.