I've tried the tutorial above and I keep getting the error:

message '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 128.

I tried downloading the finished application and ran that and got the same error. Any help would be greatly appreciated.

The line of code that throws this exception is

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

The particular statement that's throwing the exception is

entry.GetDatabaseValues()

I know because I broke the above statement down into the method call followed by the ToObject method followed by the cast to Department.

I have been trying to figure this out for 3 hours. I put a breakpoint there and looked around for a while, but I didn't get anything useful. I tried to view the definition for the GetDatabaseValues method but it takes me to the DLL code where the method is just declared followed by a semicolon.

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

This doesn't work. The fact that when you break the code down like this:

1 var e = entry.GetDatabaseValues();

2 var o = e.ToObject();

3 var d = (Department)o;

4 var databaseValues = d;

Line 1 throws the exception. That's proof positive that the screwy namespace reference is coming from either entry or the GetDatabaseValues() statement.

If you swap the order of the statements around to this:

1 var clientValues = (Department)entry.Entity;

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

Line 1 throws the exception. That says to me the problem is probably with the GetDatabaseValues() method.

I suppose it should be possible to use LINQ to grab the record from the database and see if that works. I'll try this and make another post if I have success.

var databaseValues = db.Departments.Where(i => i.DepartmentID == department.DepartmentID).Single();

Stops the exception and you get the concurrency error, but if you click Save again to go through with the changes, it just gives you the error again, so this still isn't right.

stackoverflow.com/

I didn’t understand how exactly you have suggested to fix this error (

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

)

Any ideas? Thanks

@tdykstra - thanks for such a quick response and Happy Holidays!

At the end of the last exercise of Chapter 7 (the concurrency lesson), after the 2nd browser has deleted the Department record, the first browser will still be showing the now deleted Department.

If you click Edit in the first browser, the application will show the familiar but ugly "Object reference not set to an instance of an object"

message because obviously Find(id) will fail .

Just something to keep in mind.

i did the folloiwng:-

1. included a timestamp column in my databse

2. i have included at time stamp at the model class

3.and then i set the concurrency = Fixed for the timestamp.

4. i provide the timestamp as a hidden field inside the view.

So might might be the problem?

Thanks

HTH.

message '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 128.

Solution :

-I moved the SchoolContext.cs and the "initializer" (<-- no need, but it is ok to move this one) to the DAL folder inside the Models folder.

- Excluded the DAL folder in the main solution

-I rewrote the using statments after building the project which gave massive errors and warnings

-Treated them all back into health

AND

The concurrency on both Edit and Delete just simply worked.

STARNGE huh!!!