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Asked: 2026-05-18T19:41:18+00:00

I had been struggling today with the linq2sql dbml design files. When I start

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I had been struggling today with the linq2sql dbml design files. When I start out and place my tables on the designer everything is OK. Them I modify the namespaces and turn off the connection string properties for the data context. Then I want to create partial extensions of my linq entities. So I hit F7 on the files designer. At this point everything is cool too. Then when I change something with the DB’s schema I go back and add another table or delete and re-add an old one, the MyContext.dbml loses the MyContext.design file underneath it. The other 2 (the .cs and the .layout are still there). Naturally it breaks everything I need to start from scratch. Very annoying. Any ideas?

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1 Answer

  1. Editorial Team

    Ah! Yes! You’re using VS2008, right?

    This is a known bug, and it actually matters where your using directives are in your half of the partial class…

    using Foo;
namespace Bar {
    // ...
}

    is bad, and trashes the designer file…

    namespace Bar {
    using Foo;
    // ...
}

    is fine!

    This only applies when you have SomeName.dbml and SomeName.cs, so another fix is to rename the file. This is fixed in VS2010. Crazy, huh?

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