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The Entity Framework has a particularly elegant way of dealing with relationships. Rather than forcing you to use specific methods or separate queries, you can simply move from one record to its related data using the navigation properties that are defined in the data model. It all starts with the entity model diagram. There, you ll see dotted lines that indicate each relationship. For example, consider the portion of the diagram shown in Figure 24-10.

In this exercise, you will write an application that uses the RF module (and indirectly the provider) installed in Exercise 7-1. The goal is to create a simple application for reading tags using the mobile platform. 1. Start Visual Studio, click File New Project, and then select the Smart Device category from under the Visual C# node (as shown in Figure 7-8). Select the Smart Device Project type, and then select an appropriate location (such as C:\temp\) and name the project HelloMobileRfid. Click OK to open the Add New Smart Device Project dialog. 2. From the Add New Smart Device Project dialog, select Windows Mobile 5.0 Pocket PC SDK and .NET Compact Framework Version 3.5, as shown in Figure 7-9.

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Figure 24-10. Relationships between the Customer, Order, Order_Detail, and Product entities The 0..1, 1, and * characters at either end of the dotted line give you additional information about the relationship. For example, a relationship line that goes from 1 to * (like the one between the Order and Order_Detail entities) indicates a one-to-many relationship. Each parent record in the first table (Order),

If you would like to draw your own user interface, you ll need some basic information about the Canvas. You can find out the size of the Canvas by calling getWidth() and getHeight(). As we ll discuss later, you can also find out the color capabilities of the device by calling methods in Display.

where the 1 is shown, has one or more matches in the child table (Order_Detail), where the * is shown. (To actually figure out what fields are involved in a given relationship, you need to double-click the relationship line.) A relationship line that goes from 0..1 to * indicates a one-to-many relationship that allows null values. In other words, the 0 represents that there may be no match. For example, in the data model shown in Figure 24-10, the Order.CustomerID property can be null. That means that for each Order record, there may be one matching Customer entity or none.

A relationship line that goes from * to * indicates a many-to-many relationship that s connected with the help of a junction table. For example, in the Northwind database every Customer record can have one or more associated CustomerDemographic records, and every CustomerDemographic record can have one or more associated Customer records. To implement this design, the database uses a junction table named CustomerCustomerDemo. Essentially, each record in CustomerCustomerDemo is a pairing that links one record in Customers to one record in CustomerDemographics. (In fact, the CustomerCustomerDemo has just two fields: CustomerID, which points to the Customers table, and CustomerTypeID, which points to the CustomerDemographics table.) This setup may seem a bit awkward, but it s a standard part of database diagram. The neat part is that the Entity Framework is intelligent enough to pick up on this sort of association. Instead of translating the table model to your entity classes exactly (and creating a Customer, CustomerDemographic, and CustomerCustomerDemo entity), the Entity Framework generates just the Customer and CustomerDemographic entities. It links them together using the power of collections, giving you a more natural object model to work with. And best of all, the Entity Framework manages the CustomerCustomerDemo table behind the scenes. For example, if you add a new related CustomerDemographic for an existing Customer (as you ll learn to do later in this chapter), the Entity Framework automatically creates the CustomerCustomerDemo record that connects them.

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