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Regardless of the technique you adopt to fill the Items collection, you should perform this action only the first time the page is requested hence the use of the IsPostBack function in the preceding code snippet because the EnableStateView property is set to True by default. Therefore, the content of a control is automatically preserved in subsequent postbacks. In some cases, you can optimize your application s perfor mance by disabling the ViewState feature for specific controls and filling the control anytime the page is loaded. Figure 24-16 shows the demo program at design time and inside the browser. All the controls except RadioButtonList were filled using data binding, as I ll explain in the Data Binding with List Controls section in 25.

protected void CreateControlHierarchy() { // Add the label var lbl = new Label(); lbl.Text = "Some text"; Controls.Add(lbl);

Part VI:

// Add a blank literal control for spacing Controls.Add(new LiteralControl("  ")); // Add the text box var txt = new TextBox(); txt.Text = String.Empty; Controls.Add(txt); // Specifies that child controls have been created ChildControlsCreated = true; }

Fortunately, you don t have to assign these properties individually, at least not if you re satisfied with the predefined styles that Visual Studio .NET displays when you click on the Auto Format command in the Properties window or in the control s shortcut menu. (See Figure 24-17.)

In Report Manager, click the My Subscriptions link in the top right corner of the browser window. Your screen looks similar to this:

The ultimate goal of CreateControlHierarchy is populating the Controls collection of the current control with all child controls in the proper position in the final hierarchy. The ChildControlsCreated Boolean property is defined on the Control class and indicates whether all child controls have been created or not. For a composite control, you don t need to override the Render method, but it is recommended that you implement the marker interface INamingContainer to facilitate ASP.NET s ability to recognize postback events caused by any child control. Finally, a method that is worth mentioning regarding composite controls is EnsureChildControls. This method checks whether all child controls have been created and, if not, it re-creates them. How can the control know about that It simply reads the value of the ChildControlsCreated Boolean property and calls CreateChildControls if all child controls haven t been created. The following code snippet illustrates the behavior of EnsureChildControls:

Figure 24-17 Visual Studio .NET predefined calendar styles. Please note that the calendar auto matically adapts to the user's locale (Italian, in this case).

protected virtual void EnsureChildControls() { if (!ChildControlsCreated) { try { CreateChildControls(); } finally { ChildControlsCreated = true; } } }

To get a grip on building new ASP.NET controls, let s create a control with a limited state but a significant rendering engine. The control, named SimpleGaugeBar, is a simple,

You can customize how each individual day cell is rendered by trapping the DayRen der event. The second argument for this event exposes two properties:

non-data-bound gauge bar that you can use to implement a rating system that represents the progress made for certain tasks. Generally, it can be used to give a friendly user interface to measurable quantities.

Day is the CalendarDay object that describes the day being rendered, and exposes properties such as Date, DayNumberText (the text used to render the day), IsToday, IsWeekend, IsOtherMonth, IsSelected, and IsSelectable. You can set the IsSelectable property to False to prevent the user from selecting this date. All other properties are read-only. Cell is the TableCell object that affects the appearance of the cell. This object derives from WebControl and therefore exposes all the usual properties, such as ForeColor, BackColor, and the like, plus a few additional properties, such as HorizontalAlign and VerticalAlign.

A gauge control needs to have at least two properties one to indicate the value being rendered, and one that provides the scale. In addition, you can also give users a chance to control the ruler and the descriptive text for the gauge. Table 12-2 lists the properties of a gauge control.

For example, see how you can use the DayRender event to change the background color of the days in the range 12/24 to 12/26 and make them nonselectable:

TABLE 12-2