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Here s how you could rewrite the earlier example with a Using block: Dim myConnection As New SqlConnection(connectionString) Try Using myConnection ' Try to open the connection myConnectionOpen() lblInfoText = "<b>Server Version:</b> " & myConnectionServerVersion lblInfoText &= "<br /><b>Connection Is:</b> " & _ myConnectionStateToString() End Using Catch err As Exception ' Handle an error by displaying the information lblInfoText = "Error reading the database" lblInfoText &= errMessage End Try.

lblInfo.Text &= "<br /><b>Now Connection Is:</b> " lblInfo.Text &= myConnection.State.ToString() There s one difference in the way this code is implemented as compared to the previous example. The error-handling code wraps the Using block. As a result, if an error occurs the database connection is closed first, and then the exception-handling code is triggered. In the first example, the error-handling code responded first, and then the Finally block closed the connection afterward. Obviously, this rewrite is a bit better, as it s always good to close database connections as soon as possible.

The Connection object provides a few basic properties that supply information about the connection, but that s about all. To actually retrieve data, you need a few more ingredients: A SQL statement that selects the information you want A Command object that executes the SQL statement A DataReader or DataSet object to access the retrieved records Command objects represent SQL statements. To use a Command, you define it, specify the SQL statement you want to use, specify an available connection, and execute the command. You can use one of the earlier SQL statements, as shown here: Dim myCommand As New SqlCommand() myCommand.Connection = myConnection myCommand.CommandText = "SELECT * FROM Authors ORDER BY au_lname" Or you can use the constructor as a shortcut: Dim myCommand As New SqlCommand(_ "SELECT * FROM Authors ORDER BY au_lname ", myConnection)

For the time problem, goal seek to determine how fast you would go if you traveled 12 kilometers in 8 minutes. 1. In cell D6, type 12. 2. Click Tools Goal Seek. 3. In the Set Cell box, type or click cell D5. 4. In the To Value box, type 8. 5. In the By Changing Cell box, type or click cell D4. 6. Click OK, and click OK again. Answer: You would go about 90 kilometers per hour if you traveled 12 kilometers in 8 minutes.

Summary

Note It s also a good idea to dispose of the Command object when you re finished, although it isn t as

Once you ve defined your command, you need to decide how you want to use it. The simplest approach is to use a DataReader, which allows you to quickly retrieve all your results. The DataReader uses a live connection and should be used quickly and then closed. The DataReader is also extremely simple. It supports fast-forward-only read-only access to your results, which is generally all you need when retrieving information. Because of the DataReader s optimized nature, it provides better performance than the DataSet. It should always be your first choice for direct data access.

Before you can use a DataReader, make sure you ve opened the connection: myConnection.Open() To create a DataReader, you use the ExecuteReader() method of the command object, as shown here: ' You don't need the new keyword, as the Command will create the DataReader. Dim myReader As SqlDataReader myReader = myCommand.ExecuteReader() These two lines of code define a variable for a DataReader and then create it by executing the command. Once you have the reader, you retrieve a single row at a time using the Read() method: myReader.Read() ' The first row in the result set is now available.