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1. Right-click MyWebService on the design surface and select Connect. 2. In the Create Connection dialog box, click the down arrow of the Application box in the Connect To section and select the name of your back-end database component, MyDatabase, as shown in Figure 8-8. Click the down arrow in the Endpoint selection box and select the name of the endpoint associated with the database you selected. This will be the same name as the database, by default. Click OK.

s Note When using the Create Connection dialog box, by default, you are presented with only endpoints that are compatible with the component with which you are working. In this simple example, we have only two components so far. In a complex solution with many components, this feature helps aid in maintaining the overall integrity of the design.

The next chapter discusses reliable messaging and how it is implemented in WCF. Reliable messaging is an important concept in distributed computing; it enables reliable communication channels between multiple enterprises (on heterogeneous platforms) with failover mechanisms.

3. In the Choose Data Source dialog box, enter the data source and data provider. For this example, select Microsoft SQL Server and the .NET Data Provider for SQL Server, respectively.

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In the Application Designer, we can define and visualize the applications that can provide services or use these services within the scope of a Visual Studio solution. We can visualize Windows applications, web applications and services, external web services, external systems and applications, as well as databases. Figure 7-47 shows that this designer has a toolbox to the left of the screen, from where we can drag and drop applications on our canvas to the right. In this case, you can see a solution with one Windows application and one web application. You can also see one web service (the Order Process service), which these two applications connect to. Furthermore, you can see that this web service connects to an internal, already-existing database and one external web service (the Credit Card web service), also existing. In this solution, all applications not already existing will be developed in the project.

WCF helps you implement reliable communications over an infrastructure that might be unreliable. Application infrastructure is prone to failure. Network connectivity often breaks, services might not always be available, and messages get lost. WCF provides you with the functionality to overcome these limitations in the infrastructure. You will learn in this chapter how to ensure reliable communication in a distributed environment where the application endpoints might be available only intermittently. Reliable messaging in WCF helps developers solve a number of challenges that have plagued them for many years. You will learn about the following in this chapter: The need for reliable messaging Challenges in implementing reliable messaging Reliable sessions Queuing support in WCF How to integrate with legacy applications using MSMQ

4. In the Connection Properties dialog box, enter the database server name, the security context, and the database name. (You can simply enter a period for the server name to indicate your local SQL Server installation, or enter .\sqlexpress for default installations of SQL Express edition.) Click Test Connection to verify that the configuration information for the data source is correct, as shown in Figure 8-9.

s Note Optionally, if you are just whiteboarding an application design, you can cancel out of the Connection

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