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Many applications have need to manage content that goes beyond what s traditionally stored in a database. Beyond the usual numbers and strings, there s a world of other data formats, from audio and video to print-ready Portable Document Format (PDF) files and plenty more. Content like this isn t well suited for being stored directly in the database though in some cases it s at least possible but it s still useful to tie it to other content that is in the database. To handle this, Django provides a special , with extra methods designed to facilitate access to files. It also uses many of the hooks described in this chapter to store a reference to the file in the database, as well as provide a special object that can access files in a portable manner. Django also provides an , which inherits much of its functionality from , while adding some of its own, specifically tailored for dealing with the special needs of images. Subclasses of shouldn t generally need to override many of its methods, since they re mostly related to those features of a file that are common to all file types. This includes things like the filename and relative path, which don t have anything to do with the specifics of a particular type of file. Some, however, such as , can be overridden to provide special handling of attributes related to a specific type of file.

Repeated-value binding allows you to bind an entire list of information to a control. This list of information is represented by a data object that wraps a collection of items. This could be a collection of custom objects (for example, with an ordinary ArrayList or Hashtable) or a collection of rows (for example, with a DataReader or DataSet). ASP.NET includes several basic list controls that support repeated-value binding: All controls that render themselves using the <select> tag, including the HtmlSelect, ListBox, and DropDownList controls The CheckBoxList and RadioButtonList controls, which render each child item with a separate check box or radio button The BulletedList control, which creates a list of bulleted or numbered points All these controls display a single-value field of a property from each data item. When dealing with one of these controls, you ll find the properties listed in Table 9-1. Table 9-1. Data Properties for List Controls

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This is a data object that contains the data to display. This data object must implement a supported interface, typically ICollection. Instead of supplying the data object programmatically (using code), you can link your list control to a data source control by setting this property. The data source control will generate the required data object automatically. You can use either the DataSource property or the DataSourceID property, but not both. Every data source represents a collection of data items. A list control can display only a single value from each list item. The DataTextField indicates the field (in the case of a row) or property (in the case of an object) of the data item that contains the value to display in the page. Specifies an optional format string that the control will use to format each DataTextValue before displaying it. This property is similar to the DataTextField property, but the value from the data item isn t displayed in the page instead, it s stored in the value attribute of the underlying HTML tag. This allows you to retrieve the value later in your code. The primary use of this field is to store a unique ID or primary key field so you can use it later to retrieve more data when the user selects a specific item.

Component reuse is discussed later in this chapter in the .NET Components section. For now, you can use the quicker App_Code approach rather than creating a full-fledged, separately compiled component.

ASP .NET uses dedicated classes called section handlers to process the information in a configuration file. In previous versions of ASP .NET, you were forced to create your own section handlers by hand. In ASP .NET 2.0, the WebConfigurationManager has the built-in smarts to parse a section of the configuration file s XML and deserialize it into the corresponding custom SectionHandler class. Here s an example that retrieves your custom configuration settings and displays them in a page: Configuration config = WebConfigurationManager.OpenWebConfiguration( Request.ApplicationPath); OrderService custSection = (OrderService)config.GetSection("orderService"); lblInfo.Text += "Retrieved service information...<br />" + "<b>Location:</b> " + custSection.Location + "<br /><b>Available:</b> " + custSection.Available.ToString() + "<br /><b>Timeout:</b> " + custSection.PollTimeout.ToString() + "<br /><br />"; Figure 5-7 shows the displayed data.

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