You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You add a ListBox to show grouped data. The ListBox is data-bound to a collection of items. Each item has the Name and State properties. You need to ensure that the ListBox meets the following requirements: Names grouped by State Names sorted in ascending order States sorted in descending order Which code fragment should you use?（）
1、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.The application displays a list of books.You wri...
2、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You add a property named ServiceContext to a co...
3、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.The application has multiple data entry windows....
4、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Forms application.You plan to use a Windows Presentation Foundation (WPF) control of the...
5、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a custom Windows Presentation Foundation (WPF) application.Your environment includes several WPF appl...
6、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You write the following code fragment. (Line num...