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DataGridView has a counterpart Web Forms control, GridView, and the same data binding princi-
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ples apply to ASP.NET 2.0 programming. Visual Web Developer 2005 Express Edition is the free IDE for developing Web applications with C# or Visual Basic.
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Try It Out: Updating a Table Using a Data Grid
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There s usually more than one way to accomplish something in VBE, so instead of modifying the ComplexBinding project, we ll create a similar but more powerful project in a slightly different way to expand our techniques for developing Windows database applications. 1. Add a Windows Application project named GridUpdate to the 09 solution. Make the project the startup project. (Yes, now, not later.) 2. Change the Text property of Form1 to Customer Maintenance. 3. On the VBE menu, click Data Add New Data Source . You see the same window as in Figure 9-5, in the section Try It Out: Using Complex Data Binding. Follow the same steps you did there to create a data source for the whole Customers table. Note that when you eventually click Finish, the data source will be created, but unlike Figure 9-11, nothing will change on your form, and no tray will appear at the bottom of the screen. However, look in Solution Explorer and you ll find northwndDataSet.xsd has been added to the GridUpdate project (see Figure 9-16).
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CHAPTER 9 s INTRODUCING DATA BINDING
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Figure 9-16. GridUpdate after adding a new data source
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4. On the VBE menu, click Data Show Data Sources. The Data Sources window appears, as in Figure 9-17.
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Figure 9-17. Data Sources window
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CHAPTER 9 s INTRODUCING DATA BINDING
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s Note You set GridUpdate as the startup project in step 1 because the Data Sources window displays the
data sources for the current startup project.
5. Click the check that appears to the right of the Customers node (if there s no check, click the Customers node to make it appear), and then click DataGridView. This chooses the control to use with the data source. Drag the Customers node onto the form and you see the screen in Figure 9-18. It s similar to Figure 9-11, but includes an extra control at the top of the form (an instance of System.Windows. Forms.BindingNavigator) and an icon for it in the component tray.
Figure 9-18. Data grid with a control bar
6. Resize the form and data grid to suit your tastes, and run the project with Ctrl+F5. You see the screen in Figure 9-19.
CHAPTER 9 s INTRODUCING DATA BINDING
Figure 9-19. A navigable and updatable Customers data grid
7. Play around with the data grid to see how the navigation control works and how you can use it to insert and delete rows in the data grid. But don t click the Save Data button! 8. Add a new row. To keep things simple, just enter zzz for both the customer and company names. Change the city for customer WOLZA from Warszawa to Gdansk. Now click the Save Data button. The new row is now inserted into the Customers table in the database, and the city for WOLZA has been updated too. Close the window and rerun the project to prove this. 9. Put Customers back the way it was by changing WOLZA s city back to Warszawa and deleting customer zzz. Click Save Data to propagate the changes to the database. Once again, you needed to write no code to access Customers, not even to perform navigation or propagate updates. Very cool!
How It Works
The key was adding the binding navigator, and in particular, the Save Data button it provided. Behind the scenes, the following code was generated for you in the event handler for the button (CustomersBindingNavigatorSaveItem_Click):
Me.Validate() Me.CustomersBindingSource.EndEdit() Me.CustomersTableAdapter.Update(Me.NorthwndDataSet.Customers)
CHAPTER 9 s INTRODUCING DATA BINDING
The first line fired the Validating and Validated events for the DataGridView, where you could have handled validation of the data grid changes before propagating them to the database. The second line applied the pending changes in the data grid to the data source. Keep in mind that the data source isn t the Customers database table. It s the NorthwndDataSet dataset. The third line simply does the same kind of thing you did in 8 to propagate changes to a dataset to the database. It calls the Update method on a data adapter. Here, because there is only one data table in the dataset (DataGridView cannot be bound to multiple tables), the second argument to Update() the table in the dataset to update was not required. As you also saw in 8, data adapters need to have commands to execute appropriate SQL for insertions, changes, and deletions, and all three commands were generated for NorthwndDataSet. To see them, click the dataset in the component tray, click the small box with the right arrow that appears, and click Edit in DataSet Designer . You see the screen in Figure 9-20.
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