The underlying provider failed on Open. RRS feed

  • Question

  • I've had an exception occur on a couple of different, unrelated projects which have come from either book code or Web tutorial code. It is around the Entity Framework and says:

    Entity Exception
    The underlying provider failed on Open.

    I 1st thought there might be something wrong with my PC, but I get the same errors with those projects on my laptop.

    I changed the DataConnectionString to point at my local database in those projects.

    I did up a quick fresh project with an Entity Data model and it worked fine.

    So I am at a loss as to why these projects are failing.

    Any clue?


    Sunday, June 13, 2010 8:52 AM


  • Hello,

    Would you please provide us more information? Can you please post your connection string here? You could open your connection manually using:

    // explicitly open the connection.   
    // do other stuff ...


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    Thursday, June 17, 2010 9:07 AM