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The value for this TimeStamp is one retrieved when we read the product from the database before the outof-band update Because the out-of-band update caused the TimeStamp to change, the value for the TimeStamp column in the database is different than the value of the TimeStamp property on the product entity in the object context The update statement will fail because no row is found in the table matching both the ProductId and the TimeStamp values Entity Framework will respond by rolling back the entire transaction and throwing an OptimisticConcurrencyException..

Figure 8 9. Make sure you re creating Acceptance test scenarios for requirements, not Unit test scenarios. Higher level requirements will aggregate these tests with other filter tests; e.g., when testing the Filter Hotels requirement, the test plan should specify testing an amenity filter set concurrently with a date range:

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Instead of acting as parameters in a SQL statement or stored procedure, they re passed here as arguments to the corresponding methods they re declared for For example, in this case because you declared a SelectParameter, the ObjectDataSource will automatically pass an Int32 to the SelectMethod, which in this case is GetBook Let s take a look at the code for GetBook, which is a method of BookBinding, the type named by the TypeName property This is different than BookDetails, the type named by the DataObjectTypeName property BookDetails is the type that BookBinding will create collections of and use for data updates public List<BookDetails> GetBook(int BookId) { List<BookDetails> bookList = new List<BookDetails>(); bookListAdd(new BookDetails(BookId)); return bookList; } So GetBook returns a generic List of BookDetails objects Because it accepts a BookId as an argument, there will only ever be one book in the list This is by design.

In responding to the exception, the code in Listing 14-1 printed a message and continued. This is probably not how you would handle a concurrency violation in a real application. One way to handle this exception is to refresh the entity with the current value of the concurrency column from the database. With the correct value for the concurrency column, a subsequent SaveChanges() will likely succeed. Of course, it might not for the same reason that it failed the first time, and you need to be prepared for this as well. The Refresh() method on the object context is used to refresh an entity including the current value of the concurrency column. It takes two parameters: a RefreshMode and an entity. With RefreshMode.ClientWins, property changes made to the entity in the object context are not updated from the database. Only the values, such as the concurrency column value, that are different in the database but not changed in the object context are updated on the entity. In short, changes made in the object context (client) are kept. With RefreshMode.StoreWins, changes made to the entity in the object context are overwritten by values from the database. The database wins. After calling Refresh(), the entity in the object context has the values reflecting either the client winning or the database winning. Calling SaveChanges() at this point will generate a new update statement with the new values. This update will either succeed or fail with possibly another OptimisticConcurrencyException if an intervening update statement once again changed the values in the database.

Find a golf resort on Maui that s available on the last weekend in May (over Memorial Day weekend).

You want to use optimistic concurrency when using stored procedures for the insert, update, and delete actions.

The ObjectDataSource associated with this method will bind to a DetailsView control, which only displays a single row at a time..

Let s suppose we have a table like the one shown in Figure 14-3 and the entity shown in Figure 14-4 that is mapped to the table.

Figure 8 10. Test View with the new Acceptance test scenarios With the requirements tests (or acceptance tests in EA nomenclature) added in, wouldn t it be nice if you could generate a clear, uncluttered test report that can be handed straight to the testers and the customer Let s do that next

Note This method uses a new feature of the .NET Framework called generics, which enable you to create and use types that have some dynamic type information built into the definition. In this case, you re creating a collection of objects, but the type in the collection is declared at the same time you declare the list using the <TypeName> syntax. For a detailed discussion of generics, see Pro C# and the .NET 2.0 Platform by Andrew Troelsen (Apress, 2005).

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