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Defining a Relationship Using Visual Studio .NET
In this section, you'll see how to create a Windows application in Visual Studio .NET
(VS .NET) with a DataSet containing two DataTable objects. These DataTable objects
will reference the Customers and Orders database tables. You'll then learn how to define
a relationship between the two DataTable objects in the XML schema.
Create the Windows Application
Perform the following steps to create the Windows application:
1. Open VS .NET and select File ➣ New ➣ Project and create a new Windows
Application. Enter the name of the project as DataRelation, as shown in Figure
12.2.
Figure 12.2: Creating the Windows application
2. Click the OK button to continue.
3. Open Server Explorer and connect to the Northwind database using the connection
you used in the previous chapters. You can open Server Explorer by selecting
View ➣ Server Explorer. Expand the Tables node in the tree and select both the
Customers and Orders tables by Ctrl +left-clicking each table, as shown in Figure
12.3.
Figure 12.3: Selecting both the Customers and Orders tables from Server Explorer
4. Drag the Customers and Orders tables to your form. VS .NET then creates three
objects in the tray beneath your form. These objects are named sqlConnection1
(used to access the Northwind database), sqlDataAdapter1 (used to handle access
to the Customers table), and sqlDataAdapter2 (used to handle access to the Orders
table). These objects are shown in Figure 12.4
.
Figure 12.4: The new objects in the tray beneath the form
5. Next, you need a DataSet object that contains DataTable objects to store the rows
from the Customers and Orders tables. To create a DataSet object, click your