Error: type or namespace name could not be found

[ptcoderCO]

Hello all. I am getting this error when I attempt a build of my Visual Studio 2008 project. The build works fine on another computer, but not on this one. It appears there is some sort of reference missing, but I have no idea where to even look. All the references look the same on the two machines, but I don't know what to look for regarding data context references.

Here is the complete error message:

The type or namespace name 'MyDataContext' could not be found (are you missing a using directive or an assembly reference?)

Here is the beginning of my Class that throws the error:

public partial class alerts : System.Web.UI.Page
{
MyDataContext mydata = new MyIntouchDataContext();

Also, intellisense recognizes the MyDataContext so not sure why it is erroring on this. I actually have the same build error on all of my data context references throughout the project. I am just showing this one because they are all the same (just different name).

What should I be looking for? Has anyone experienced this issue?

Thanks for your assistance!

[TheCPUWizard]

There is simply not enough information available, except to state the obvious...."MyDataContext " is not a valid unqualified identifier in the current context.

[ptcoderCO]

What information can I supply to help? My application uses Linq to SQL and I generate a .DESIGNER file from a .DBML file. The data context is in the designer file and that is what I am referencing in my CS page. I am starting to think this will be like a needle in the haystack to find. I was really hoping someone experienced this and knows the fix. Since this is not a namespace, I am thinking it has to do with the VS 2008 configuration (the project file). If you Google the error (The type or namespace name 'MyDataContext' could not be found (are you missing a using directive or an assembly reference?) you will find a million hits. None of them so far help me or provide any hints.

I don't know what else I can say about the issue. Throw some questions at me and maybe that will help.

Thanks a ton!!

[ptcoderCO]

I forgot to mention, I am trying to do a build of my project and with these errors, the build fails. If I could somehow do a build and ignore these errors, that would at least get me past this temporarily.

[TheCPUWizard]

What information can I supply to help?

The FIRST step is to reduce the problem to the miimal subset that reproduces the issue.

I don't know what else I can say about the issue. Throw some questions at me and maybe that will help.

Thanks a ton!!

What is the capital of North Dakota???

[See first part of reply]

[mmetzger]

From The Simpsons:

TV: The capital of North Dakota is named after what German ruler...
Homer: Hitler!
Marge: Hitler North Dakota?
Patty / Selma: Bismarck
Bart (closely after): Bismarck - Hitler, pah...
Homer: Hey, I'm still beating you boy....


As for the issue you're seeing - a couple of things to look at off the top of my head...

- Using IIS or the integrated development server?
- Any service pack differences between the machines (ie, .NET 3.5 vs 3.5SP1?)
- Are you using straight webforms or MVC? If MVC, is it installed on the 2nd machine? If MVC, is it the same release (preview 3/4/5/etc?)
- Does the 2nd machine have permissions to the underlying data source? Shouldn't cause a problem but maybe something is screwing up underneath.
- Can you create a new project / DBML file to the same data source and have it work?

[ptcoderCO]

To respond to your questions:

- Using IIS or the integrated development server? IDS
- Any service pack differences between the machines (ie, .NET 3.5 vs 3.5SP1?) None, I just checked again.
- Are you using straight webforms or MVC? If MVC, is it installed on the 2nd machine? If MVC, is it the same release (preview 3/4/5/etc?) Straight web forms
- Does the 2nd machine have permissions to the underlying data source? Shouldn't cause a problem but maybe something is screwing up underneath. Yes, all permissions match and the app actually works fine. I just can't execute a new build. I need to do a build, but with these errors, it fails.
- Can you create a new project / DBML file to the same data source and have it work? I created a new project just now and it works exactly the same as the other project. Exact same errors.

Thanks for your help!! By the way, not following the meaning of the Simpsons stuff in the reply.

[mmetzger]

Heh - sorry about the Simpsons, it was just in reference to TheCPUWizard's question about the capital of North Dakota.


As for the not being able to build a new DBML / project, that's very likely where you should start. Maybe try a different data source (Northwind or a test DB) - also, just for kicks check your application event log for any strange errors.

[ptcoderCO]

Thanks for your help. This is pretty frustrating and I need to get this to compile this morning if possible so if anyone has experienced this and can help me, I sure would appreciate it!

When I right click on the class name and select "Go to definition", I get this error: "Cannot navigate to MyDataContext"

How do I fix this so the page knows it's there? The odd thing is that the pages all work fine. I just can't do a new compile.

Here's the code again that throws the error:

public partial class settings : System.Web.UI.Page
{
MyDataContext mydata = new MyDataContext(); (the error is on the first MyDataContext on this line)

This happens with any class that references the MyDataContext.


Please help if you can!! Thanks a ton!

[mmetzger]

Have you validated your namespaces?

[ptcoderCO]

I am sorry for my lack of knowledge on this, but what do you mean by "validate namespace"? How do I do that?

Thanks again!

[ptcoderCO]

I just noticed that on the PC that works that if I open the DBML file and right click and open the Properties, there is a window in the lower right corner that displays all the class information. This is what I am missing on my Visual Studio project. The PC that is throwing the error was setup as a Project and the one that works was setup as a Web Site. I tried to open a new one as a Web Site, but still the same problem.

Is this simply a Visual Studio configuration issue?

[ptcoderCO]

I actually do have the Properties for DBML. I overlooked that.

Still can't get this to compile. This must be a pretty rare issue. Can I pay someone to help me??????? I hate to have to call Microsoft, but it's looking like that might be my only option.

[mmetzger]

It's going to be difficult to find out exactly what's going on without seeing it - your best bet may be to open a support case.