Chapter 13 p446 No context objects listed

Thomas Kennedy · July 15th, 2011, 12:26 PM

It says

In the Data Source Configuration Wizard dialog box, ensure that the PlanetWroxDataContext class is selected and click Next...

There are no data contexts shown; the list is empty. Everything in the chapter has worked up to this point. What could be the problem?

I'm using VWD 2010 Express.

Imar · July 15th, 2011, 12:41 PM

Hi there,

Does you site have any compilation errors? To check, right-click the project in the Solution Explorer and choose Build or Rebuild. Then check the Errors List and if it's empty, try the wizard again.

Also, try restarting Visual Studio / VDW.

Finally, did you place the model in the correct folder? Can you see the dbml in the App_Code folder and does it have a "code behind" file?

Imar

Thomas Kennedy · July 15th, 2011, 02:47 PM

Yes the dbml is in App_Code and has its code-behind.

The first compile error says

The type or namespace name 'Linq' does not exist in the namespace 'System.Data' (are you missing an assembly reference?) C:\BegASPNET\Site\App_Code\PlanetWrox.designer.cs

The web.config contains:

Code:

<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

As an aside there is no 'Version=3.5.x' version of that line.

Also, when I added Picture and PhotoAlbum on page 445 it asked me if I wanted to set myself up as owner, which I had already done in a previous example (in chapter 12 I think).

And, the Linq examples up to this point work fine.

Imar · July 15th, 2011, 03:38 PM

Are you doing this in VS 2010 with .NET 4?

You could try resetting the framework bindings, like this:

1. Right-click the project and choose Property Pages
2. On the Build Tab, switch to .NET 4 if the curent version is 3.5, or the other way around
3. Click OK to apply the changes
4. Try again
5. If it still doesn't work, follow step 1-3 again, and switch to the other framework.

All of this should work under 3.5 and 4.0

If it keeps failing, send me a zipped copy of the site and I'll have a look...

Cheers,

Imar

Thomas Kennedy · July 15th, 2011, 04:12 PM

I switched it to 3.5, rebuilt, that didn't help, I closed it and had some tea, then switched it back 4.0 and it works.

Imar · July 15th, 2011, 04:19 PM

Tea is always the magic answer when programming.....;-)

Imar