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Note For your own solutions, you ll need to carefully decide on which user controls to implement output page caching. You can start experimenting by playing with the different controls that you implemented for BalloonShop so far. One thing you should be aware of is that output page caching doesn t always behave as expected during client postbacks generated by other user controls in the page. For this reason, it s advisable to test your solution seriously every time you change output cache options.

All three data-binding techniques inline binding, list binding, and table binding apply only to Web controls because the whole process takes place on the server before the page is sent to the client. Technically speaking, every Web control must understand how to bind data to its properties, because it inherits the DataBind() method as something it must implement from its parent System.Web.UI.Control class. At the least, this means that every Web control understands inline binding and can set its properties to values from a database. Some Web controls also know how to bind lists and tables of data into their structure. Table 6-1 shows which groups of Web controls support which type of binding.

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Protected Overrides Sub CreateChildControls() Dim count As Integer = 0 For row As Integer = 0 To Rows For col As Integer = 0 To Cols count += 1 ' Create and configure a button. Dim ctrlB As New Button() ctrlB.Width = Unit.Pixel(60) ctrlB.Text = count.ToString() ' Set the onClick attribute with a reference to ' __doPostBack. When clicked, ctrlB will cause a ' postback to the current control and return ' the assigned text of ctrlB. ctrlB.Attributes("onClick") = _ Page.ClientScript.GetPostBackEventReference(Me, ctrlB.Text) ' Add the button. Controls.Add(ctrlB) Next ' Add a line break. Dim ctrlL As New LiteralControl("<br />") Controls.Add(ctrlL) Next End Sub

To handle the postback, your custom control also needs to implement the IPostBackEventHandler interface, as shown here:

Summary

HtmlControl-derived Web controls for inline binding but, in all cases, there is a WebControl equivalent that you should use instead.

Public Class ButtonGrid Inherits System.Web.UI.Control Implements IPostBackEventHandler ' (Control code goes here.) End Class

You then need to create a method that implements the IPostBackEventHandler.RaisePostBackEvent() method. This method is triggered when your control fires the postback, and it receives any additional information that is submitted through the GetPostBackEventReference() method. In the ButtonGrid control, this extra information is the text of the button that was clicked:

This chapter was very short, indeed, especially since it covered a topic that s very complex by its nature. Although ASP.NET performance tuning is out of the scope of this book, you took a quick look at the most useful features that allow you to improve a web site s performance. In the next chapter, you ll learn how to accept payments for BalloonShop using PayPal.

Public Overridable Overloads Sub RaisePostBackEvent( _ ByVal eventArgument As String) _ Implements IPostBackEventHandler.RaisePostBackEvent ' (Respond to postback here.) End Sub

HyperLink, Label, Literal, Localize, Xml Button, CheckBox, FileUpload, HiddenField, ImageButton, LinkButton, RadioButton, TextBox BulletedList, CheckBoxList, DropDownList, ListBox, RadioButtonList AdRotator, Image, ImageMap, Panel, PlaceHolder Calendar, Table, TableCell, TableFooterRow, TableHeaderCell, TableHeaderRow, TableRow CompareValidator, CustomValidator, RangeValidator, RegularExpressionValidator, RequiredFieldValidator, ValidationSummary DataGrid, DataList, DetailsView, FormView, GridView, Menu, Repeater, SiteMapPath, TreeView Content, ContentPlaceHolder ChangePassword, CreateUserWizard, Login, LoginName, LoginStatus, LoginView, PasswordRecovery CompleteWizardStep, CreateUserWizardStep, MultiView, TemplateWizardStep, View, Wizard, WizardStep DeclarativeCatalogPart, ImportCatalogPart, PageCatalogPart AppearanceEditorPart, BehaviorEditorPart, LayoutEditorPart, PropertyGridEditorPart ErrorWebPart, UnauthorizedWebPart CatalogZone, ConnectionsZone, EditorZone

Once you receive the postback, you can modify the control or even raise another event to the web page. To enhance the ButtonGrid by using this approach, you need to define an additional EventArgs class:

Public Class GridClickEventArgs Inherits System.EventArgs Private _buttonName As String Public Property ButtonName() As String Get Return _buttonName End Get Set(ByVal Value As String) _buttonName = Value End Set End Property Public Sub New(ByVal buttonName As String) Me.ButtonName = buttonName End Sub End Class

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