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The HtmlTextArea control corresponds to the <textarea> HTML element and allows you to programmatically create and configure a multiline text box. The HtmlTextArea class provides the Rows and Cols properties to control the number of rows and columns of the text box. The Value property can be used to assign some text to display in the control area. The HtmlTextArea class also provides a ServerChange event that fires during a postback and allows you to validate on the server the data contained in the control. Note that the HtmlTextArea control does not fire the event itself and does not directly cause the page to post back. Rather, when the page posts back in response to a click on a link or submit button, the HtmlTextArea control intervenes in the server-side chain of events and gives the programmer a chance to run some code if the internal content of the control is changed between two successive postbacks. All ASP.NET controls that, like HtmlTextArea, implement the IPostBackDataHandler interface can invoke user-defined code when the control s internal state changes. As discussed in 5, controls can fire custom events by overriding the RaisePostDataChangedEvent method on the aforementioned interface. The following pseudocode shows what happens in the method s implementation of HtmlTextArea:

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void System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() { this.OnServerChange(EventArgs.Empty); }

an empty string, and for this reason it doesn t appear in the ValidationSummary control or in the message box.

Finally, note that the control raises the event only if the state has changed between two successive posts. To determine whether that has happened, the control needs to track the content it had the time before. This value can be stored only in the view state. Of course, the ServerChange even won t fire if you disable the view state for the host page or the control.

Regardless of whether client-side scripts are enabled, all the validation controls validate their companion controls when the page is submitted to the server, without any interven tion on you part. Nevertheless, you usually explicitly perform server-side validation in a specific location in code such as in the Page_Load event or in the Click event of the button that fires the postback so that your application can take any step that is appropriate. You can force the validation of all controls by invoking the Validate method. Then you can check the page s IsValid property and, if False, iterate over all the validation con trols to detect which fields contain invalid values:

helpful if you need to raise events on the server based on changes to the data (method RaisePostDataChanged). Again, the TextBox is the perfect sample control; if the data changed between postbacks, the TextChanged event is also raised.

Private Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) _ Handles Button1.Click Force the validation of all controls. Me.Validate() If Not Me.IsValid Then Dim errorCount As Integer Count how many errors were found. For Each ctrl As BaseValidator In Me.Validators If Not ctrl.IsValid Then errorCount += 1 Next Display a suitable error message. lblStatus.Text = There are & errorCount.ToString & errors." End If End Sub

IPostBackEventHandler The interface serves to capture a client-side postback event (for example, a click). Upon postback, after raising data change events, the ASP.NET runtime looks for a server control whose UniqueID property matches the name of a posted value (for example, the name of the clicked button). If a match is found and the control implements IPostBackEventHandler, ASP.NET invokes the RaisePostBackEvent method on the control. RaisePostBackEvent is the only method defined on the IPostBackEventHandler interface. What a particular control does within the RaisePostBackEvent method can vary quite a bit. The Button control a simple control that implements this interface fires its Click event when ASP.NET invokes the RaisePostBackEvent method.

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