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Another powerful technique is to reuse images by making them part of your theme. For example, imagine you perfect an image that you want to use for OK buttons throughout your website and you have another image for all the cancel buttons. The first step in implementing this design is to add the images to your theme folder. For the best organization, it makes sense to create one or more subfolders just for holding images. In Figure 15-7, the images are stored in a folder named ButtonImages.

You ll see a list that includes all the methods in your class that match the signature this event requires You can then choose a method from the list to connect it Figure 2-21 shows an example where the ButtonClick event is connected to the Button_Click() method in your page class The only limitation of this technique is that it works exclusively with web controls, not server-side HTML controls..

} else if (ctrl is PlaceHolder) { ph = (PlaceHolder)ctrl; } else if (ctrl is Label) { lbl = (Label)ctrl; } } // Load the dynamic content into this panel. string ctrlName = list.SelectedItem.Value; if (ctrlName.EndsWith(".ascx")) { ph.Controls.Add(Page.LoadControl(ctrlName)); } lbl.Text = "Loaded..." + ctrlName; } Figure 14-8 shows this example in action.

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Now you need to create the skins that use these images. In this case, both of these tags should be named skins. That s because you re defining a specific type of standardized button that should be available to the page when needed. You aren t defining a default style that should apply to all buttons. <asp:ImageButton runat="server" SkinID="OKButton" ImageUrl="ButtonImages/buttonOK.jpg" /> <asp:ImageButton runat="server" SkinID="CancelButton" ImageUrl="ButtonImages/buttonCancel.jpg" /> When you add a reference to an image in a skin file, always make sure the image URL is relative to the theme folder, not the folder where the page is stored. When this theme is applied to a control, ASP .NET automatically inserts the Themes\ThemeName portion at the beginning of the URL. Now to apply these images, simply create an ImageButton in your web page that references the corresponding skin name: <asp:ImageButton ID="ImageButton1" runat="server" SkinID="OKButton" /> <asp:ImageButton ID="ImageButton2" runat="server" SkinID="CancelButton" /> You can use the same technique to create skins for other controls that use images. For example, you can standardize the node pictures used in a TreeView, the bullet image used for the BulletList control, or the icons used in a DataGridView.

Visual Studio 2005 uses automatic event wire-up, as indicated in the Page directive. Automatic event wire-up has two basic principles: All page event handlers are connected automatically based on the name of the event handler. In other words, the Page_Load() method is automatically called when the page loads. Visual Studio adds a comment to your page class to point out the commonly used event methods. All control event handlers are connected using attributes in the control tag. The attribute has the same name as the event, prefixed by the word On. For example, if you want to handle the Click event of the Button control, you simply need to set the OnClick attribute in the control tag with the name of the event handler you want to use. Here s the change you need: <asp:Button id="cmdOK" OnClick="cmdOK_Click" runat="server"> ASP.NET controls always use this syntax. Remember, because ASP .NET must connect the event handlers, the derived page class must be able to access the code-behind class. This means your event handlers must be declared with the protected or public keyword. (Protected is preferred, because it prevents other classes from seeing this method.)

Figure 14-8. A dynamic web page with multiple user controls Using this technique to build an entire web portal framework is possible, but it requires significant work before it would be practical. Creating this framework is a tedious, time-consuming task. In 30 you ll learn about a web parts, a native ASP .NET solution for building web portals that doesn t force you to reinvent the wheel. Web parts are based, at least in part, on user controls.

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