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CHAPTER 11 PROGRAMMING ADO.NET
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The modified code for the second part of the sample appears next. A critical part of the solution is the While...End While statement. This loop successively passes through column values for all the rows for the ProductCategory table. The second column value, with a column index value of 1, contains the Name column values. Therefore, on each pass through the While loop, the code adds the value from the second column to the Items collection for ListBox1. After passing through all the rows (there are only four of them), the ListBox control displays the Name column values from the ProductCategory table. There are a couple of other design features that are worthy of mention. First, the code clears the Items collection of ListBox1 just before populating the Items collection of ListBox1. If this task weren t performed, each time a user clicked Button3, it would add to the existing items in the ListBox control instead of replacing the items in the control. Second, the sample sets the height of ListBox1 to 65 pixels just after populating the control. By resizing the ListBox control, you can avoid displaying empty white space below the items. The default height of a ListBox control in VBE is 95 pixels. Try Me.ListBox1.Items.Clear() While rdr1.Read() Me.ListBox1.Items.Add(rdr1.GetString(1)) End While Me.ListBox1.Height = 65 Catch ex As Exception MessageBox.Show(ex.Message) Finally rdr1.Close() cnn1.Close() End Try Figure 11-6 shows Form3 after the Click event for Button3 completes. Notice that the ListBox control displays the names of the four product categories from the ProductCategory table. Also, notice that the ListBox is sized so that it fits just those four items. If you added additional rows to the ProductCategory table, VBE would automatically add a vertical scroll bar to the ListBox control, or you could assign a new, larger value to the Height property for the ListBox control. On the test computer used for these samples, I need to add between 16 and 17 pixels per new item added to the Items collection for the ListBox control. The pixel size on your computer may dictate different sizing for the ListBox control and the amount to add for each new item.
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Figure 11-6. It is easy to adapt the samples for showing SqlDataReader contents in message boxes for other purposes, such as populating a ListBox control.
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CHAPTER 11 PROGRAMMING ADO.NET
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Performing Data Definition and Database Maintenance
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In its most general sense, an ADO.NET Command object is a wrapper for one or more SQL statements. Anything that you can do with SQL, you can do with ADO.NET Command objects. Up until this point in the chapter, the focus has been on data retrieval namely, recovering single values and rowsets from a database with a Command object. However, you can do much more. This section introduces you to using the ExecuteNonQuery method for a Command object. This method is appropriate for any ADO.NET Command object that does not return any data from a query statement. Therefore, the ExecuteNonQuery method especially targets Command objects wrapping SQL statements that perform data maintenance (inserts, updates, and deletes), as well as data-definition tasks, such as creating a table. Both of these topics were covered extensively with T-SQL in 4 and 7. The objective of this section is to present a set of simple samples that show you how to get started performing data maintenance and database definition with the SqlCommand object. The samples for this section reside in Form4 of the WinCh11 project. In this section, you ll learn how to add and drop a table from a database. In addition, you ll learn how to insert rows in your newly created table. You ll also learn how to search for a row in your table and then either update the row or delete it.
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