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Public Class ButtonGrid Inherits System.Web.UI.Control Public Sub New () Rows = 2 Cols = 2 End Sub Public Property Cols() As Integer Get Return CType(ViewState("Cols"), Integer) End Get Set(ByVal Value As Integer) ViewState("Cols") = Value End Set End Property Public Property Rows() As Integer Get Return CType(ViewState("Rows"), Integer) End Get Set(ByVal Value As Integer) ViewState("Rows") = Value End Set End Property 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()

' Add the button. Controls.Add(ctrlB) Next ' Add a line break. Dim ctrlL As New LiteralControl("<br />") Controls.Add(ctrlL) Next End Sub End Class

Although implementing output page caching saves the database, it occupies web server memory. For this reason, it isn t feasible to implement output caching for controls such as ProductsList, which have a very large number of display possibilities. ProductsList has a different output for every department and category, not to mention the endless search possibilities.

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In 3, you used a SqlDataSource to populate both a DropDownList with the list of Manufacturers in the database and a GridView with a filtered list of Players. The one thing you didn t do was write any code to access the database. You used the following process to add a data-bound Web control using a SqlDataSource: 1. Add a SqlDataSource to the page. 2. Add a data-aware Web control to the page. 3. Associate the SqlDataSource with the data-aware Web control using the DataSourceID property. You ll notice that you do not make an explicit call to DataBind(), as you do when you write code to access the database. So how is the data binding done Automatic data binding occurs, with a call to DataBind() on the Web control, after the OnPreRender event and before the OnPreRenderComplete event in the page life cycle. Although the DataBind() method is called automatically when using a SqlDataSource, that doesn t mean that you can t call DataBind() on the Web control to force the data binding to occur if necessary.

Raising an event from a control is just as easy as it was with a user control. All you need to do is define the event (and any special EventArgs class) and then fire it with the RaiseEvent statement. However, to raise an event, your code needs to be executing and for your code to be triggered, the web page needs to be posted back to the server. If you need to create a control that reacts to user actions instantaneously and then refreshes itself or fires an event to the web page, you need a way to trigger and receive a postback. In an ASP .NET web page, web controls fire postbacks by calling a special JavaScript function called __doPostBack(). This function was described in 7. The __doPostBack() function accepts two parameters: the name of the control that triggered the postback and a string representing additional postback data. You can retrieve a reference to the __doPostBack() function using the special Page.GetPostBackEventReference() method in

your rendering code. (Every control provides the Page property, which provides a reference to the web page where the control is situated.) The GetPostBackEventReference() method allows you to perform an interesting trick namely, creating a control or HTML link that invokes the __doPostBack function. As you may remember from 6, the __doPostBack triggers an immediate postback, which allows your code to run on the server. By using this feature in your control, you have a handy way to cause a postback whenever you need to perform some server-side processing. The easiest way to perform this magic is usually to add a JavaScript onClick attribute to an HTML element. Anchors, images, and buttons all support the onClick attribute. Consider the ButtonGrid control. Currently, the buttons are created, but there is no way to receive their events. You can change this by setting each button s onClick attribute to refer to the __doPostBack() function. The added lines are highlighted in bold in the following code:

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