Are there any side effects of returning from inside a using() statement?

Question

Returning a method value from inside a using statement that gets a DataContext seems to always work fine, like this:

public sta         


        

Answer 1

Yes, there can be a side effect. For example, if you use the same technique in ASP.NET MVC Action method, you will get the following error: "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection"

public ActionResult GetMostRecentTransaction(int singleId)
{
    using (var db = new DataClasses1DataContext())
    {
        var transaction = (from t in db.Transactions
                              orderby t.WhenCreated descending
                              where t.Id == singleId
                              select t).SingleOrDefault();
        return PartialView("_transactionPartial", transaction);
    }
}