Using Data Synchronization Services in Visual Studio .NET

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862 Building a Data Synchronization Service For our Data Synchronization Service we ll implement a very simple example; one that updates some of the Customers of the Northwind database We develop our service, and its client application, through a specific sequence of steps Not only is this sequence probably the easiest way to do the development, but it also helps to illustrate the nature of a Data Synchronization Service and its relationship to the NET Compact Framework client application Specifically, we will do the following
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1 Create a Visual Studio 2008 solution that contains a Windows Communication Foundation (WCF) Service Library project and a Smart Device project The former will evolve into our Data Synchronization Service; the latter will be our client application 2 Use the Sync Services Designer Wizard to generate code, some of which will be inserted in the service application and some into the client application Most importantly, the code that is inserted into the client application will talk to two synchronization providers: one that connects to SQL Server CE on the device and one that connects to the server-side data store 3 Modify and complete the service application Some of the changes we must make, such as specifying the URL, are applicable to any Data Synchronization Service; others, such as the Web binding to be used, will make the service accessible to a mobile device client 4 Once the service definition is complete, turn to our client project and add a Web reference to that service, thus generating proxy code in our client application This code, also, will need to be modified, mainly because it will contain class definitions that we do not want; class definitions that conflict with definitions that are already in the Framework Class Library 5 Once our client has the correct code for accessing the service, add the core functionality of our application A simple diagram of the completed application is shown in Figures 834 and 835 located near the end of this chapter Readers are encouraged to view these figures as we proceed through the development of the application Let us begin
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Before starting development of a Data Synchronization Service and its consuming Smart Device client application, ensure that you have the necessary software on your development machine You ll need Visual Studio 2008 SP1 or later for development You will also need Microsoft Synchronization Services SP1 (Devices) or later (Support for desktop clients comes with Visual Studio 2008, but for NET Compact Framework clients you will need this separate download) For the server-side data store, SQL Server 2005 or later is needed; SQL Server 2008 makes life easier; an Express version of either will do just fine And lastly, for the client-side data store you ll need SQL Server CE 35 SP1 or later
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8621 Beginning Development of Both Projects
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We begin the actual development by creating a solution, named DataSyncDemo, containing two projects: a Visual C# / WCF / WCF Service Library project named SyncClnt and a Visual C# / Smart Device / Smart Device Project / Device Application named SyncServ Figure 817 shows the resulting Solution Explorer window As we can see from Figure 817, we have a device application with a default form defined and a service application with a default WCF Service and contract defined These last two are of no use to us, and we will delete them shortly What we want is not a WCF Service but rather a Data Synchronization Service To have Visual Studio generate the starter code for us, we need to invoke the Configure Data Synchronization Wizard To do that, we need to add a Local Data Cache item to our project Which project you ask Normally, it would not matter which project, for the wizard will generate code into both projects, which is why we
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