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You can use one more technique to store data in a file serialization. Serialization is a higher-level model that s built on .NET streams. Essentially, serialization allows you to convert an entire live object into a series of bytes and write those bytes into a stream object such as the FileStream. You can then read those bytes back later to re-create the original object. For serialization to work, your object must all meet the following criteria: The object must have a Serializable attribute preceding the class declaration. All the public and private variables of the class must be serializable. If the class derives from another class, all parent classes must also be serializable. Here s a serializable class that you could use to store log information: [Serializable()] public class LogEntry { private string message; private DateTime date; public string Message { get {return message;} set {message = value;} } public string DateTime { get {return date;} set {date = value;} } public LogEntry(string message) {

Figure 14-9. Content that varies by control selection You can handle this using the VaryByControl attribute and referring specifically to this control: <%@ OutputCache Duration="30" VaryByControl="lstMode" %> When you try this example, you ll see a different date for each option, which emphasizes that ASP .NET maintains a separate cached copy for each list selection.

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Because each provider uses the same interfaces and base classes, you can still write generic data access code (with a little more effort) by coding against the interfaces instead of the provider classes. You ll see this technique in action in the section Provider-Agnostic Code. Because each provider is implemented separately, it can use proprietary optimizations. (This is different from the ADO model, where every database call needs to filter through a common layer before it reaches the underlying database driver.) In addition, custom providers can add nonstandard features that aren t included in other providers (such as SQL Server s ability to perform an XML query). ADO.NET also has another layer of standardization: the DataSet. The DataSet is an allpurpose container for data that you ve retrieved from one or more tables in a data source. The DataSet is completely generic in other words, custom providers don t define their own custom versions of the DataSet class. No matter which data provider you use, you can extract your data and place it into a disconnected DataSet in the same way. That makes it easy to separate data retrieval code from data processing code. If you change the underlying database, you will need to change the data retrieval code, but if you use the DataSet and your information has the same structure, you won t need to modify the way you process that data.

this.message = message; this.date = DateTime.Now; } }

When you request your web page in a browser, ASPNET starts by finding the associated code file Then, it generates a variable declaration for each control you have For example, imagine you have a text box named txtInput: <asp:TextBox id="txtInput" runat="server"/> ASPNET generates the following member variable declaration and merges it with your page class using the magic of partial classes: protected SystemWebUITextBox txtInput; Of course, you won t see this declaration But you rely on it every time you write a line of code that refers to the txtInput object (either to read or to write a property): txtInputText = "Hello"; To make sure this system works, you must keep both the aspx markup file (with the control tags) and the cs file (with the source code) synchronized.

The next chapter covers the DataSet in much more detail. In this chapter, you ll learn the fundamentals how to use ADO.NET to perform direct, connection-based access.

In some cases, a class might contain data that shouldn t be serialized. For example, you might have a large field you can recalculate or re-create easily, or you might have some sensitive data that could pose a security request. In these cases, you can add a NonSerialized attribute before the appropriate variable to indicate it shouldn t be persisted. When you re-create the class, nonserialized variables will return to their default values.

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