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To implement on-demand downloading of assemblies, you need to use the WebClient you saw earlier, in conjunction with the AssemblyPart class. The WebClient retrieves the assembly, and the assembly makes it available for downloading. Dim uri As String = Application.Current.Host.Source.AbsoluteUri Dim index As Integer = uri.IndexOf("/ClientBin") ' In this example, the URI includes the /ClientBin portion, because we've ' decided to place the DLL in the ClientBin folder. uri = uri.Substring(0, index) & "/ClientBin/ResourceClassLibrary.dll" ' Begin the download. Dim webClient As New WebClient() AddHandler webClient.OpenReadCompleted, AddressOf webClient_OpenReadCompleted webClient.OpenReadAsync(New Uri(uri)) When the assembly is downloaded, you use the AssemblyPart.Load() method to load it into the current application domain: Private Sub webClient_OpenReadCompleted(ByVal sender As Object, _ ByVal e As OpenReadCompletedEventArgs) If e.Error IsNot Nothing Then ' (Add code to display error or downgrade gracefully.) Else Dim assemblypart As New AssemblyPart() assemblypart.Load(e.Result) End If End Sub Once you ve performed this step, you can retrieve resources from your assembly and instantiate types from it. It s as though your assembly had been a part of the XAP file from the start. You can try a demonstration of this technique with the sample code for this chapter. Once again, it s important to keep track of whether you ve downloaded an assembly, so you don t attempt to download it more than once. Some applications daisy chain assemblies, so one application downloads other dependent assemblies on demand, and these assemblies download additional assemblies when they need them.

SQL Server 2008 allows you to create SQL Server logins and associate them to credentials. Credentials contain authentication information for connecting to resources outside of SQL Server. Credentials generally contain Windows username and password information used internally by SQL Server to access an outside resource. You can associate credentials to Windows and

If you attempt to use an assembly that hasn t been downloaded, you ll receive an exception. However, Tip

iOS, Android, Blackberry, and Windows Mobile have toolbars (see Figures 10 3 and 10 4). Toolbars sit on the bottom of the screen on iOS and Android, and in custom locations on BlackBerry and Windows Mobile.

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A user connects to SQL Server using their SQL Server login account, and then they need to perform an action on the server using the credential that they are associated with to access that resource. SQL Server will use the username and password from the credential to fulfill the request. You can map multiple SQL Server logins to the same credential. In this example, you are going to link a credential to a SQL Server login. Following the syntax in Listing 8-1, you can see that linking a login to a credential is straightforward. The first thing you do is supply the username that you want associated to the credential and the password, and then specify the credential name that you are assigning the user to. (See the following code sample.) The example also shows you how to create a credential.

the exception won t be raised to the code that is attempting to use the assembly. Instead, that code will be aborted, and the exception will pass to the event handler for the Application.UnhandledException event. The actual exception is a FileNotFoundException object, and the message includes the name of the missing assembly.

In this chapter, you explored the Silverlight application model in detail. You reexamined the application object, and considered how you can react to application events and store application resources. Next, you considered practical techniques that depend on the application class, such as passing initialization parameters from different web pages, moving from one page to another in your Silverlight application, and displaying a splash screen while your application is being downloaded. Finally, you explored the resource system that Silverlight uses, and considered the many options for deploying resources and class libraries, from placing them alongside your assembly to downloading them only when needed.

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