单项选择题 You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application uses the LINQ ParallelEnumerable. AsParallel method to perform multiple queries on a database. You need to ensure that queries can execute on separate threads concurrently. What should you do? （）

单项选择题 You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You create a class named Person that has a FirstName property and a LastName property. You create a resource that contains a collection of Person objects and assign the family key to it. You add a ListBox control by using the following code fragment. (Line numbers are included for reference only.) You need to ensure that each item in the ListBox control meets the following requirements: Contains a TextBox that is data-bound to the FirstName property. Contains a TextBox that is data-bound to the LastName property. Which code fragment should you insert at line 04?（）

单项选择题 You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You declare a class named PictureContainer that has a property named Photo. The Photo property is of the byte[] type and contains an image in the JPEG format. You assign a collection of the PictureContainer elements to the current DataContext. You need to create a ListBox control that displays the images. Which code fragment should you use?（）