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Listing 2-6. Recipe 2-2 s MainPage.xaml File <UserControl x:Class=" Ch02_ProgrammingModel.Recipe2_2.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" Background="White"> <Grid.RowDefinitions> <RowDefinition Height="138*" /> <RowDefinition Height="162*" /> </Grid.RowDefinitions> <StackPanel Grid.Row="1" > <Button Click="Button_Click" Margin="4" Content="Click To Load XAML from Managed Code" /> <Grid x:Name="GridforManagedCode" Margin="4"></Grid> </StackPanel> </Grid> </UserControl> Now that you know how to load XAML using JavaScript, let s move on to showing you how to load XAML using managed code. In Listing 2-6, you can see a nested Grid control named GridforManagedCode. To load XAML using managed code, you can use the XamlReader.Load(xamlString) method. It takes a valid XAML fragment as a string. The string must contain the Silverlight namespace in the root of the XAML fragment. Here is the code from MainPage.xaml.cs with the namespace as part of the root Ellipse element: string xamlString = "<Ellipse xmlns=\http://schemas.microsoft.com/winfx/2006/xaml/presentation\ Height=\"200\" Width=\"200\" Fill=\"Navy\" Grid.Column=\"1\" Grid.Row=\"1\" />"; UIElement element = (UIElement)XamlReader.Load(xamlString); GridforManagedCode.Children.Add(element); Figure 2-10 shows the output from Recipe 2-2.

{ //access the received data byte[] Message = new byte[e.BytesTransferred]; Array.Copy(e.Buffer, 0, Message, 0, e.BytesTransferred); //do something to process the received message //keep receiving ReceiveMessage(); })); } }

Note A component that implements the org.zkoss.zk.ui.IdSpace interface denotes that itself and all of its descendant form an independent ID space.

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And in fact, most kids are not that inventive and will really only bother applying for jobs where there is actually some kind of on-campus recruiting event. Kids at good colleges have enough choices of good jobs from the oncampus employers that they rarely bother reaching out to employers that don t come to campus. You can either participate in this madness, by recruiting on campus, which is a good thing, don t get me wrong, or you can subvert it, by trying to get great kids a year or two before they graduate. I ve had a lot of success doing it that way at Fog Creek. The process starts every September, when I start using all my resources to track down the best computer science students in the country. I send letters to a couple of hundred Computer Science departments. I track down lists of CS majors who are, at that point, two years away from graduating (usually you have to know someone in the department, a professor or student, to find these lists). Then I write a personal letter to every single CS major that I can find. Not email, a real piece of paper on Fog Creek letterhead, which I sign myself in actual ink. Apparently, this is rare enough that it gets a lot of attention. I tell them we have internships and personally invite them to apply. I send

N ote The Completed handlers are called on a background thread, necessitating a context switch using

Dispatcher, before you can invoke code running on the main UI thread. For more about Dispatcher, refer to

Silverlight applications using sockets have to satisfy cross-domain policy requirements to access remote socket servers. Cross-domain policies for both HTTP and TCP communications are discussed in greater detail in Recipe 7-6. There is also a restriction on the range of ports that a Silverlight client can connect to the port must be within the inclusive range of 4502 to 4534.

The code sample for this recipe builds a simple one-to-one chat application that consists of a server program that acts as the listener and the gateway for exchanging text-based messages between Silverlight clients.

In addition to resolving the problem of identifier conflict, ID spaces make it easy to refer to a component inside or outside of an ID space by simply invoking the getFellow() method.

To start the whole environment, you must first start up the sockets server and the policy server. Both of these are console programs and can be started either from the command line or from inside Visual Studio if you intend to start them in debug mode. The sockets server, which is named ChatBroker.exe, accepts one parameter on the command line: the port number you want it to listen on. Ensure that this is within the allowed port range of 4502 to 4534, inclusive. If you are debugging this from within Visual Studio, you can specify the parameter in your project s Debug properties page. The policy server is called PolicyServer.exe and does not need any startup parameters. When you have the server instances up and running, you can then start (either in debug mode or by browsing to the page) the client. Figure 7-7 shows the various states of the Silverlight client.

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