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contributed field types. After perusing the README text, you can decide which of the contributed field types you would like to have available. These should also go into the modules/flexinode folder on the web server. In the end, an installation of Flexinode with all available field types will look like Figure 4-7.

3. ListBox1_SelectIndexChanged 4. ListBox2_SelectIndexChanged 5. Button_Click 6. Page_PreRender 7. Page_Unload Note that the order in which the SelectionIndexChanged events occur might vary, depending on the order in which the user clicked them before pressing the button. They don t necessarily fire in chronological order, as this list indicates.

The first step in creating a custom flexinode type is naming and describing it. Then you can add your content type fields. As an example, let s say you want to create a type called Basketball Team and populate it with fields to track such things as a list of players, the team colors, and the team s motto.

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To create a flexinode type, choose administer content content types add content type (admin/node/types/add_type). The content type name and description that you choose for your new type are analogous to the names and descriptions you can see for existing node types when you click create content (node/add). The help text will appear at the top of the form when you or other web users create new instances of the custom node. Use this field to give any special instructions that might be helpful to your users when creating new nodes of this type. Figure 4-8 shows an example of defining a new flexinode type named Basketball Team.

Data binding is a vital part of making web applications easy to develop. In short, it enables us to automatically set properties on a control from the contents of a database or other data store. It involves little to no coding on the developer s part. It is a tool provided by the ASP .NET Framework. We ll be going into this very important functionality in more detail in 4. One issue to note is the timing at which the data-binding functionality occurs. Any data binding that updates the data store via an insert, a delete, or an update will occur after all the control events are handled, but before the Page_PreRender occurs. Then, after the PreRender event, the functionality that queries the data store will fire. This ensures that data isn t stale, because any functionality on your page that updates the data store will happen before anything is read from the data store. Therefore, the data on your page is always up-to-date.

The name and description you give your new content type appear with its choice on the content-creation form. Figure 4-9 shows the Basketball Team type added to the list of content choices.

To maintain application scalability, the server sends the results of the page rendering to the client, and in its memory, cleans up everything for a particular session. The server now forgets about the page, and control is returned to the browser. Information that is necessary for the server to remember the page again at the next session is stored in view state, and the page is initialized with this information on the next postback.

Figure 4-9. After creating the Basketball Team flexinode type, it appears in the list of content type choices. Notice its description shows up in this list.

Because ASP .NET is a true object-oriented development API, the page itself is an object that is accessible to the developer, as are the controls on the page (which are members of

The help text you added for your new content type is displayed on the content-creation form for that type, as shown in Figure 4-10.

Figure 4-10. When you select to use the Basketball Team flexinode type, its help text appears near the the top of the form.

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