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public override Type ExtensionType { get { return typeof(SoapLog); } } In addition, you can add properties that will supply extra bits of initialization information to your SOAP extension. The following example adds a Name property, which stores the source string that will be used when writing event log entries, and a Level property, which configures what types of messages will be logged. If the level is 1, the SoapLog extension will log only error messages. If the level is 2 or greater, the SoapLog extension will write all types of messages. If the level is 3 or greater, the SoapLog extension will add an extra piece of information to each message that records the stage when the log entry was written. private string name = "SoapLog" ; public string Name { get { return name;} set { name = value; } } private int level = 1; public int Level { get { return level;} set { level = value; } } You can now apply this custom attribute to a web method and set the Name and Level properties. Here s an example that uses the log source name EmployeesService.GetEmployeesCount and a log level of 3: [SoapLog(Name="EmployeesService.GetEmployeesCount", Level=3)] [WebMethod()] public int GetEmployeesCount() { ... } Now, whenever the GetEmployeesCount() method is called with a SOAP message, the SoapLog class is created, initialized, and executed. It has the chance to process the SOAP request message before the GetEmployeesCount() method receives it, and it has the chance to process the SOAP response message after the GetEmployeesCount() method returns a result.

Gets the unique identifier name for the HtmlInputControl. Gets the type of an HtmlInputControl. For example, if this property is set to text, the HtmlInputControl is a text box for data entry. Gets or sets the value associated with an input control. The value associated with a control depends on the type of control. For example, in a text box this property contains the text entered in the control. For buttons, this defines the text on the button.

To try this with the sample code included for this chapter, request the PageProcessor_Start.aspx , which includes a button that takes you to the time-consuming PageProcessor_Target.aspx using the page processor.

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The SoapExtension class we ll use to log messages is fairly long, although much of the code is basic boilerplate that every SOAP extension uses. We ll examine it piece by piece. The first detail to notice is that the class derives from the abstract base class SoapExtension. This is a requirement. The SoapExtension class provides many of the methods you need to override, including the following: GetInitializer() and Initialize(): These methods pass initial information to the SOAP extension when it s first created. ProcessMessage(): This is where the actual processing takes place, allowing your extension to take a look at (and modify) the raw SOAP. ChainStream(): This method is a basic piece of infrastructure that every web service should provide. It allows you to gain access to the SOAP stream without disrupting other extensions.

Table 4-6 lists all the available HTML server controls and the specific properties and events that each one adds to the base class. As noted earlier, the declaration of HTML server controls on the page is the same as what you use for normal static HTML tags, with the addition of the

As you can see, with just a small amount of client-side JavaScript code, you can keep the user informed that a page is processing. By keeping users informed, the level of perceived performance increases.

Here s the class definition: public class SoapLog : SystemWebServicesProtocolsSoapExtension { .. } ASP NET calls the GetInitializer() method the first time your extension is used for a particular web method It gives you the chance to initialize and store some data that will be used when processing SOAP messages You store this information by passing it back as the return value from the GetInitializer() method When the GetInitializer() method is called, you receive one important piece of information the custom attribute that was applied to the corresponding web method In the case of the SoapLog, this is an instance of the SoapLogAttribute class, which provides the Name and Level property.

runat="server" attribute. It is this attribute that allows ASP .NET to process them and translate them into instances of the corresponding .NET class. For this reason, the HTML server controls are a good option if you re converting your existing HTML or ASP page to an ASP .NET web form. Table 4-6. HTML Server Control Classes

The previous example demonstrated how JavaScript can help you create a more responsive interface This advantage isn t limited to page processors You can also use JavaScript to download time-consuming portions of a page in the background Often, this requires a little more work, but it can provide a much better user experience For example, consider a case where you re displaying a list of records in a GridView One of the fields displays a small image This technique, which was demonstrated in 10, requires a dedicated page to retrieve the image, and, depending on your design, it may require a separate trip to the file system or database for each record In many cases, you can optimize this design (for example, by preloading images in the cache before you bind the grid), but this isn t possible if the images are retrieved from a third-party source.

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