c# - MVC Error: Object reference not set to an instance of an object

Question

I am as many others following the MVC Music Store Tutorial, but I'm stuck with an error.

At page 48, the tutorial says to write an ActionResult-view:

 public ActionResult Index()
    {
        var genres = storeDb.Genres.ToList()

        return View(genres);
    }

but I get an error on genres. Visual Web Developer says "value cannot be null".

what should I set genres to? var genres = new ??

Thank you!

Darin Dimitrov · Accepted Answer · 2011-02-05 12:15:36Z

2

Make sure you have specified a connection string to your database in web.config. Also make sure you initialize the storeDb variable before using it:

public ActionResult Index()
{
    var storeDb = new StoreDbDataContext(); // Replace this with the actual type
    var genres = storeDb.Genres.ToList();
    return View(genres);
}

answered Feb 5, 2011 at 12:15

Darin Dimitrov

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