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Select the Use data bound items check box to populate the ListBox control with Items based on a data source from the Data Sources window or a new data source that you can add to the project for the control If you select the Use data bound items check box, the smart tag window for the ListBox expands to show a Data Binding Mode section Use the Data Source drop-down box to select a DataTable name within a DataSet corresponding to one of the data sources in the Data Sources window After you select the DataTable, the Windows Form Designer populates the Data Source drop-down box with the name of a BindingSource object, such as ProductCategoryBindingSource1 Your selection for the Data Source drop-down box will populate the Display Member dropdown box with column names from the DataTable selected for the Data Source drop-down box.

In 1 you prepared prepared your computeryour computer by installing SQL Server Express and the AdventureWorks2008 sample databases. You learned how to get around in SQL Server Management Studio and learned a few other tips to help make writing queries easier. Now that you are ready, it is time to learn how to retrieve data from a SQL Server database. You will retrieve data from SQL Server using the SELECT statement, starting with the simplest syntax. This chapter will cover the different parts, called clauses, of the SELECT statement so that you will be able to not only retrieve data but also filter and order it. The ultimate goal is to learn to get exactly the data you need from your database no more, no less. Beginning in this chapter, you will find many code examples. Even though all the code is available from this book s catalog pages at http://www.apress.com, you will probably find that by typing the examples yourself you will learn more quickly. As they say, practice makes perfect! In addition, exercises follow many of the sections so that you can practice using what you have just learned. You can find the answers for each set of exercises in the appendix.

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' Create connection Dim conn As SqlConnection = New SqlConnection(connString)

Display Member column values appear as items in the ListBox control when users open the form The Value Member drop-down box offers the same selection of column names as the Display Member drop-down box Value Members correspond in a one-to-one way with Display Member column values The currently selected item in a ListBox control normally has contrasting colors to other unselected items The Value Member column value corresponding to the selected item is available as the SelectedValue property for the ListBox control The SelectedValue entry is normally left at its default value of none Figure 13-19 shows the smart tag window for the NameListBox control The settings will cause the control to display Name column values and have a SelectedValue property corresponding to a row value from the ProductCategoryID column in the ProductCategory DataTable..

Figure 13-19. Select the Use data bound items check box in the smart tag window for a ListBox to select display and value members from a binding source. Form7 uses a pair of TextBox controls to track the SelectedValue and SelectedIndex property values for the NameListBox control. These two values update when the Form7 loads initially and whenever a user clicks a new item in the ListBox control. The BindingNavigator control does not contribute to this solution. Therefore, Form7 s Load event procedure assigns False to the Visible property of the BindingNavigator control. This hides the control. Figure 13-20 shows Form7 after a click to the Clothing item. Notice the value of 3 for the SelectedValue property. The number corresponds to the ProductCategoryID column value for the row with a Name column value of Clothing. The SelectedIndex value is a zero-based series that is for the ListBox items. The value 0 corresponds to Bikes. Therefore, the value 2 is the index value for Clothing.

Now you have a connection, but you still need to establish a session with the database by calling the Open method on the connection. If the attempt to open a session fails, an exception will be thrown, so you use a try statement to enable exception handling. You display a message after calling Open(), but this line will be executed only if the connection was successfully opened:

Note If you take a look at SQL Server Books Online, you will find the syntax displayed for each kind of

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