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One of the tasks you might want to do when a user clicks a button is to open a new window The first thing you ll need to do is add a new window To make this work, you would open Solution Explorer, right-click the project you re working with, select Add | New Item, choose Window (WPF), name the window NewOrderxaml, and click Add This will create a new window open in the Designer
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The project s Add | New Item context menu includes a Window entry, which can save a couple of clicks when creating a new window
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After the Designer loads, you can quickly open the code-behind by pressing F7 In the code-behind, you ll see the following code: C#:
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public partial class NewOrder : Window { public NewOrder() { InitializeComponent(); } }
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Public Class NewOrder End Class
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Notice that the class in this code is named NewOrder, illustrating that a window is just another class As you know, you can instantiate classes and call their methods, which is the technique you ll use to open this window from the NewOrder_Click event handler in the code-behind of the MainWindow window In practice, you ll populate the NewOrder window with whatever controls you need to implement a new order You would populate the window by dragging and dropping controls, just like the Button in this example However, we ll skip that task for now because the current focus is on adding code to the NewOrderButton_Click event handler so that you can learn how to code an event handler and open another window Go back to the NewOrderButton_Click event handler in MainWindowxamlcs and add the following code: C#:
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private void NewOrderButton_Click(object sender, RoutedEventArgs e) { NewOrder newOrd = new NewOrder(); newOrdShow(); }
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Private Sub NewOrderButton_Click( ByVal sender As SystemObject, ByVal e As SystemWindowsRoutedEventArgs) Handles NewOrderButtonClick Dim newOrd As New NewOrder newOrdShow() End Sub
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Since NewOrder is a class, you can instantiate it as shown in the preceding code example To open the window, call the Show method Now you have a WPF program that handles events and opens new windows Press F5 to run the program Click New Order and observe that the New Order window appears The New Order window isn t very useful because it lacks controls and data management The next section shows you how to populate window controls with data
Working with Data in WPF
This section builds upon what you learned in 7 by showing how to bind data to WPF controls Binding is the process of populating and retrieving data to and from controls You ll learn how to show data in your user interface The examples in the
8:
Building Desktop Applications with WPF
following sections show you how to perform create, read, update, and delete (CRUD) operations via WPF You ll first see how to insert data, using VS tools to construct a data entry screen Then you ll learn how to read, modify, and delete data through a DataGrid We ll start with single value binding To make the examples more interesting, I added extra fields to the tables You can review 7 to learn how to add fields to a database and create a LINQ to SQL entity model
Setting Up a Data Source
Before you can bind to data in the window, you ll need a data source to work with data To get started, update the Order table, created in 7, so that it has the following fields:
OrderID, int, primary key, auto-increment CustomerID, int OrderDate, datetime Location, varchar(50) Amount, money Then update the Customer table with the following fields:
CustomerID, int, primary key, auto-increment Name, nvarchar(50) Age, int Birthday, datetime Income, money
With the database updated, you can add a LINQ to SQL entity model to the project, using the same techniques described in 7 To add the data source for binding, open the NewOrder window in the Designer, and select the Data | Add New Data Source menu, which opens the Choose A Data Source Type window, shown in Figure 8-11 There are different ways to connect to a data source, including directly to the database, via a Web service, via an object, or through SharePoint This book shows you how to use LINQ to SQL, which is connected by selecting Object and clicking Next, which shows the Select The Data Objects window in Figure 8-12
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