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During the flow of a Windows Forms application, you might need to fire the Paint event in your code explicitly, rather than waiting for the window to become naturally dirty by the actions of the end user. For example, you might be building a program that allows the user to select from a number of predefined images using a custom dialog box. Once the dialog box is dismissed, you need to draw the newly selected image onto the form s client area. Obviously, if you were to wait for the window to become naturally dirty, the user would not see the change take place until the window was resized or uncovered by another window. To force a window to repaint itself programmatically, you call the inherited Invalidate() method: public partial class MainForm: Form { ... private void MainForm_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; // Render the correct image here. } private void GetImageFromDialog() { // Show dialog box and get new image. // Repaint the entire client area. Invalidate(); } } The Invalidate() method has been overloaded a number of times. This allows you to specify a specific rectangular portion of the form to repaint, rather than having to repaint the entire client area (which is the default). If you wish to update only the extreme upper-left rectangle of the client area, you can write the following code: // Repaint a given rectangular area of the Form. private void UpdateUpperArea() { Rectangle myRect = new Rectangle(0, 0, 75, 150); Invalidate(myRect); }

The list controls are specialized web controls that generate list boxes, drop-down lists, and other repeating controls that can be either bound to a data source (such as a database or a hard-coded collection of values) or programmatically filled with items. Most list controls allow the user to select one or more items, but the BulletedList is an exception it displays a static bulleted or numbered list. Table 4-11 shows all the list controls. Table 4-11. List Controls

The other way to use the Web services is through Flex Builder. Let s create another application class called ASWebserviceTest.mxml. You know the routine: File New MXML Application. Then click on the menu bar and select Data Import Web Service (WSDL) as in Figure 8-25.

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Let s conclude this introductory look at the Windows Forms and GDI+ APIs by building a complete GUI application that illustrates several of the techniques discussed in this chapter. The program you will create is a rudimentary painting program that allows users to select between two shape types (a circle or

A drop-down list populated by a collection of <asp:ListItem> objects. In HTML, it is rendered by a <select> tag with the size="1" attribute. A list box list populated by a collection of <asp:ListItems> objects. In HTML, it is rendered by a <select> tag with the size="x" attribute, where x is the number of visible items. Its items are rendered as check boxes, aligned in a table with one or more columns. Like the <asp:CheckBoxList>, but the items are rendered as radio buttons. A static bulleted or numbered list. In HTML, it is rendered using the <ul> or <ol> tags. You can also use this control to create a list of hyperlinks.

rectangle) using the color of their choice to render data to the form. You will also allow end users to save their pictures to a local file on their hard drive for later use with object serialization services.

All the list controls support the same base properties and methods as other web controls. In addition, they inherit from the System.Web.UI.WebControls.ListControl class, which exposes the properties in Table 4-12. You can fill the lists automatically from a data source (as you ll learn in Part 2), or you can fill them programmatically or declaratively, as you ll see in the next section. Table 4-12. ListControl Class Properties

// OOPS! Mismatch of size and elements! int[] intArray = new int[2] { 20, 22, 23, 0 };

If True, the form is automatically posted back when the user changes the current selection. Returns a collection of ListItem objects (the items can also be added declaratively by adding the <asp:ListItem> tag in the ASPX page). Returns or sets the index of the selected item. For lists with multiple selectable items, you should loop through the collection of Items and check the Selected property of each ListItem instead. Returns a reference to the first selected ListItem. For lists with multiple selectable items, you should loop through the collection of Items and check the Selected property of each ListItem instead. You can set this property to an object that contains the information you want to display (such as a DataSet, DataTable, or collection). When you call DataBind(), the list will be filled based on that object. (Continued)

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