MSDN Magazine - January 2008 - (Page 28)

pass both ADO.NET objects—such as the DataSet—and custom entities. First, I create a Web service project and add a WebService called CustomerWebService. I add three methods to the WebService and decorate each with the WebMethod attribute: I go to the Data Sources window and click on Add New Data Source—this pops up the wizard. I choose to add an object type, click next, and locate my Customer entity from the provided list (see Figure 3). If you don’t see your entities in the list when adding [WebMethod] a new data source, make sure you have first successfully compiled public Customer GetCustomer(string customerID) { the Web service project and then go back and try again to add the data source. When an entity is exposed by the Web service, it will } not show up in the list unless the DLL has first been compiled. [WebMethod] Once the data source has been added, I drag the new Customer public DataSet GetCustomerDataSet(string customerID) { Data Source (see Figure 4) from the Data Sources window to the } dropdown list. This automatically creates a BindingSource control [WebMethod] on the form named customerBindingSource, and this handles the public List FindCustomerList() { two-way binding of the Customer entity to the controls. } There are two more steps to set up the The GetCustomer method retrieves automatic binding before I can test my a single customer record in the form application in the emulator. The next of a custom entity. The GetCustomstep is to set the DisplayMember and erDataSet method also gets a single the ValueMember properties of the customer record, but this method redropdown list. I set the DisplayMember turns the customer in a DataSet. The property to the CompanyName and FindCustomerList method gets a list of the ValueMember property to the customers, returning a List , CustomerID. Since the data source thus taking advantage of customer entiis strongly typed, these values are in a ties and generics. The full code for this dropdown list in the properties window Web service is included in the downfor the dropdown list control. loadable code. The last step is to tell the BindingOnce the Web service is created, I Source control where to get its data. add a Windows Mobile 5.0 Smartphone This is as simple as creating an instance application to the solution. If you inof the Web service proxy class, invokstall both the Windows Mobile 5.0 and Figure 3 Creating a Customer Data Source ing the appropriate method, and setWindows Mobile 6 SDKs, you can choose the target application ting its returning List to the BindingSource control’s from this dialog. For this project, I am creating a Windows Mobile DataSource property, like so: 5.0 Smartphone Device Application. private void CustomerPicker_Load(object sender, EventArgs e) { The Smartphone application will have a startup form that disusing (RemoteService.CustomerWebService svc = plays a list of customers in a dropdown list. The user can select new RemoteService.CustomerWebService()) one of the customers and then view the details of the customer customerBindingSource.DataSource = svc.FindCustomerList(); } on another page. The list of customers is retrieved from the Web service’s FindCustomerList Web method, which brings back a At this point, you can run the application and test it to see if it disList to the form. The list can then be manually or au- plays the list of customers in the dropdown list. Make sure that you tomatically bound to the dropdown list. (I will demhave set the target device in Visual Studio, that you are onstrate both techniques shortly.) running ActiveSync® or Windows Mobile Device Center (as appropriate), and that the device you are emulating Automatic Binding is cradled (use the Device Emulator Manager). The CustomerPicker form is the first screen the user will see. I add a dropdown list to this form and Binding the Fields name it ddlCustomer. I want to take advantage of After creating and testing the CustomerPicker form, automatic binding and bind my dropdown list to I then create another form called CustomerDetail. This the List that I will get back from my will display the selected customer. I change the data FindCustomerList Web method. I add a new data source source settings so that the details controls are created to the project, selecting the type of entity to which I want when I drag the Customer data source to the form, and to bind the dropdown list. Since I reference my Web then I customize which properties to display from the service, the application knows what types of entity that Data Source window. Afterwards, I drag the controls my WebMethods return. This makes it easy to bind to Figure 4 Using a to the CustomerDetail form. Figure 5 shows the Data the dropdown list with strongly typed entities. Customer Data Source Source after I have customized it. 28 msdnmagazine Data Points

Table of Contents Feed for the Digital Edition of MSDN Magazine - January 2008

MSDN Magazine - January 2008 Contents Toolbox CLR Inside Out Data Points Advanced Basics Cutting Edge IIS 7.0 - Enhance Your Apps with the Integrated ASP.NET Pipeline World Ready - Around the World with ASP.NET AJAX Applications WCF Syndication - HTTP Programming with WCF and the .NET Framework 3.5 Wicked Code Foundations Extreme ASP.NET {End Bracket}

MSDN Magazine - January 2008

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.