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ASP.NET Web Form Stages The life cycle of an ASP.NET Web Form has five basic stages: Page_Init The ASP.NET page framework uses this event to restore control properties and postback data (data entered in controls by the user before the form was submitted). Page_Load The developer uses this event either to perform some initial processing (if this is the first visit to the page) or to restore control values (if this is a postback). Validation The Validate method of ASP.NET server controls is called to perform validation for the controls. Other event handling Various controls expose many events. For example, the Calendar control exposes a SelectionChanged event, as we ll see later in this section. There s no assurance that events will be raised in any particular order, except that cached control events (as specified in the control s AutoPostBack property) are always processed before the posting event. If the page contains validation controls, you should check the IsValid property of the page and individual validation controls to determine whether validation has been passed. Page_Unload This event is called as the page has finished rendering. This would be the place to clean up any resources allocated, especially expensive resources like file handles and database connections. Simply allowing these resources to pass out of scope might not be enough, especially on a busy site, where waiting for garbage collection to occur might hinder performance.

Readers and writers are at the foundation of every I/O operation in the .NET Framework. You find them at work when you operate on disk and on network files, when you serialize and deserialize, while you perform data access, even when you read and write configuration settings. XML writers are ad hoc tools for creating XML documents using a higherlevel metaphor and putting more abstraction between your code and the markup. By using XML writers, you go far beyond markup to reach a nodeoriented dimension in which, instead of just accumulating bytes in a block of contiguous memory, you assemble nodes and entities to create the desired schema and infoset. In this chapter, we looked primarily at the programming interface of .NET XML writers specifically, the XmlTextWriter class. You learned how to create well-formed XML documents, how to add nodes and attributes, how to support namespaces, and how to encode text using BinHex and base64 encoding algorithms.

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Once upon a time, there was Ant. It was a good, established tool used to build applications in Java shops. It was ported to work in the .NET world and called NAnt (Not an Ant). From its Java ancestor, it inherited the XML declarative automation description language.

.NET XML writers only ensure the well-formedness of each individual XML element being generated Writers can in no way guarantee the well-formedness of the entire document and can do even less to validate a document against a DTD or a schema Although badly formed XML documents can only result from actual gross programming errors, the need for an extra step of validation is often felt in production environments, especially when the creation of the document depends on a number of variable factors and run-time conditions For this reason, we've also examined the key points involved in the design and implementation of a validating XML writer This chapter also featured a few custom XML-driven writers In this chapter, you learned how to write string arrays, JPEG images, and DataTable objects to specific XML schemas It goes without saying that the techniques discussed here do not exhaust the options available in the .

When a page is loaded, two scenarios are possible: this could be the first time this page is loaded, or this could be a postback. In the Page_Load event handler, the following code handles the two possible page-loading scenarios: Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles MyBase.Load Put user code to initialize the page here If Page.IsPostBack = False Then Calendar1.BackColor = System.Drawing.Color.BlanchedAlmond Calendar1.ForeColor = System.Drawing.Color.Red Calendar1.TodaysDate = "7/24/2001" LinkButton1.Enabled = False TextBox1.Text = "Hello" End If End Sub In this example, processing is done only when Page.IsPostBack is false that is, the first time the page is processed, not when a form is filled in. When

Let s try to use NAnt with this full-blown, single-line C# program:

NET Framework for those tasks For example, the XML serializer can sometimes be more effectively employed to obtain the same results (XML serializers are covered in 11) These examples were provided with a double goal: to show one way to solve a problem, and to demonstrate custom XML writers As a general guideline, bear in mind that the more specific an XML-based format is, the more a specialized writer class can help The key advantage of a writer class is perhaps not so much raw performance savings but the resultant elegance, reusability, and efficiency of the design We've also looked at an intermediate level of XML parser that falls somewhere between streaming parsers such as readers and XML DOM XML readers are great for parsing XML documents, but they work in a read-only way.

Page.IsPostBack is false, the page programmatically sets several properties of the Calendar control as well as the Enabled property of the link button and the Text property of the text box. For the Calendar control, the BackColor and ForeColor properties are set, along with the TodaysDate property. The TodaysDate property is used to set the control s view of what today s date is, which can be different from the system date on the server or the client. These simple examples of setting properties are just the tip of the iceberg as far as the level of programmatic control you can have over components. Figure 5-12 shows the ControlShowAndTell example when WebForm1.aspx is requested.

class c{static void Main(){System.Console.Write("Hello NAnt");}}

XML DOM parsers, on the other hand, make updating documents a snap but only after the documents have been fully loaded in memory The XmlTextReadWriter class incorporates a reader and a writer and coordinates their independent activity through a simple new API As a result, you can parse a document one node at a time while maintaining the ability to add, update, or delete nodes The new class is not the cure-all for any XML pains, but it can be an interesting option in some situations In 5, we'll examine the XML DOM classes that you must use when full read/write access to XML documents is critical and when the ability to perform searches takes precedence over the memory footprint..

Figure 5-12 : WebForm1.aspx, showing TodaysDate as set in code, with July 4 as the selected date In WebForm1.aspx.vb (Listing 5-9), the link button control was disabled in code, and indeed it is disabled in Figure 5-12. However, the Text property of the text box just below that was set to Hello in the Page_Load method. In Figure 5-12, the text box is set to 7/4/2001 , which happens to be the selected date as well. How did that happen The answer is the code in the Selection_Change method in Listing 5-9: Sub Selection_Change(ByVal sender As Object, _ ByVal e As EventArgs) Dim s As String s = Calendar1.SelectedDate.ToString() TextBox1.Text = s.Substring(0, s.IndexOf(" ")) End Sub Selection_Change The OnSelectionChanged attribute of the Calendar control is set to Selection_Change. Whenever the selection is changed, this method is called on the server. This simple method changes the Text property of the text box to the date that the Calendar control is set to.

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