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To make life easier, you should track the constituent controls with member variables. This allows you to access them in any method in your control. However, you shouldn t create these controls yet, because that s the function of the CreateChildControls() method. protected Label label; protected TextBox textBox; The web page won t be able to directly access either of these controls. If you want to allow access to certain properties, you need to add property procedures to your custom control class, as follows: public string Title { get {return (string)ViewState["Title"];} set {ViewState["Title"] = value;} } public string Text { get {return (string)ViewState["Text"];} set {ViewState["Text"] = value;} } Note that these properties simply store information in view state they don t directly access the child controls. That s because the child controls might not yet exist. These properties will be applied to the child controls in the CreateChildControls() method. All the controls are rendered in a <span>, which works well. It ensures that if the web page applies font, color, or position attributes to the TitledTextBox control, it will have the desired effect on all the child controls. Now you can override the CreateChildControls() method to create the Label and TextBox control objects. These objects are separated with one additional control object a LiteralControl, which simply represents a scrap of HTML. In this example, the LiteralControl wraps two nonbreaking spaces. Here s the complete code for the CreateChildControls() method: protected override void CreateChildControls() { // Add the label. label = new Label(); label.EnableViewState = false; label.Text = Title; Controls.Add(label); // Add a space. Controls.Add(new LiteralControl("  ")); // Add the text box. textBox = new TextBox(); textBox.EnableViewState = false;

textBox.Text = Text; textBox.TextChanged += new EventHandler(OnTextChanged); Controls.Add(textBox); } The CreateChildControls() code attaches an event handler to the TextBox.TextChanged event. When this event fires, your TitledTextBox should pass it along to the web page as the TitledTextBox.TextChanged event. Here s the code you need to implement the rest of this design: public event EventHandler TextChanged; protected virtual void OnTextChanged(object sender, EventArgs e) { if (TextChanged != null) TextChanged(this, e); } Figure 27-9 shows a sample page that tests the TitledTextBox control and responds to its event.

Figure 27-9. Creating a composite control with a label and text box You may prefer to follow the earlier approach and use an HtmlTextWriter to get full control over the HTML markup you render. But if you want to handle postbacks and events and create complex controls (such as an extended GridView or a navigational aid), using composite controls can simplify your life dramatically.

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If the vast majority of the site s views do update models that have attributes to be expected if you re tracking all the models in your applications the programmer overhead of having to import and apply the decorator to every view may not be worth it. Since nearly all views would need the decorator, applying the middleware makes more sense in that situation.

Another approach to creating controls is to derive a more specialized control from one of the existing control classes. You can then override or add just the functionality you need, rather than re-creating the whole control. This approach isn t always possible, because some controls keep key pieces of their infrastructure out of site in private methods you can t override. However, when it does work, it can save a lot of work. Sometimes, you might create a derived control so that you can preinitialize an existing control with certain styles or formatting properties. For example, you could create a custom Calendar or GridView that sets styles in the OnInit() method. That way, when you add this Calendar control, it s already formatted with the look you need. In other cases, you might add entirely new functionality in the form of new methods or properties, as demonstrated in the following examples.

In previous chapters, you learned how to customize the GridView to add niceties such as a summary row You also learned how to use day-specific formatting in the Calendar To implement either one of these changes, you need to handle a generic control event and wait for the element you want to format A more elegant solution would be to simply set a property and let the control handle the task You can add this extra layer of abstraction with a custom control For example, imagine you want to provide an easy way to designate nonselectable days in a calendar.

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