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Server-side events for Web controls work in much the same way as the server events of the HTML server controls. Instead of the ServerClick events, there is a Click event, and instead of the generic ServerChange events there are specific events such as CheckedChanged (for the RadioButton and CheckButton) and TextChanged (for the TextBox), but the behavior remains the same. The key difference is that web controls support the AutoPostBack feature described in the previous chapter, which uses JavaScript to capture a client-side event and trigger a postback. ASP .NET receives the posted-back page and raises the corresponding server-side event immediately. To watch these events in action, it helps to create a simple event tracker application (see Figure 4-8). All this application does is add a new entry to a list control every time one of the events it is monitoring occurs. This allows you to see the order in which events are triggered and the effect of using automatic postback.

You use these methods to fill the interior of a given geometric shape. All FillXXX() methods require that you use GDI+ Brush objects.

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Figure 4-8. The event tracker In this demonstration, all control change events are handled by the same event handler, CtrlChanged: <form id="form1" runat="server"> <div> <h3>List of events:</h3> <asp:ListBox id="lstEvents" runat="server" Height="107px" Width="355px"/> <br /><br /> <h3>Controls being monitored for change events:</h3> <asp:TextBox id="txt" runat="server" AutoPostBack="true" OnTextChanged="CtrlChanged"/> <br /><br /> <asp:CheckBox id="chk" runat="server" AutoPostBack="true" OnCheckedChanged="CtrlChanged"/> <br /><br /> <asp:RadioButton id="opt1" runat="server" GroupName="Sample" AutoPostBack="true" OnCheckedChanged="CtrlChanged"/> <asp:RadioButton id="opt2" runat="server" GroupName="Sample" AutoPostBack="true" OnCheckedChanged="CtrlChanged"/> </div> </form> The event handler simply adds a new message to a list box and scrolls to the end: Protected Sub CtrlChanged(ByVal sender As Object, ByVal e As EventArgs) Dim ctrlName As String = (CType(sender, Control)).ID lstEvents.Items.Add(ctrlName & " Changed") ' Select the last item to scroll the list so the most recent ' entries are visible. lstEvents.SelectedIndex = lstEvents.Items.Count - 1 End Sub

Note that you cannot create the Graphics class directly using the new keyword because there are no publicly defined constructors. So, how do you obtain a valid Graphics object I m glad you asked!

[Bindable] private var ip : String; public function init() : void { myService.GetGeoIPContext.send(); } public function getGeoIPContextHandler(event : ResultEvent) : void{ ip = event.result.IP; } ]]> </mx:Script> </mx:Application> When I run the code, it will obtain my public IP address as shown in Figure 8-24.

Automatic postback isn t always a good thing. Posting the page back to the server interrupts the user for a brief amount of time. If the page is large, the delay may be more than a noticeable flicker. If the page is long and the user has scrolled to the bottom of the page, the user will lose the current position when the page is refreshed and the view is returned to the top of the page. Because of these idiosyncrasies, it s a good idea to evaluate whether you really need postback and to refrain from using it for minor cosmetic reasons.

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