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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. SqlDataReader myReader; 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.

Tip The Server Explorer window is particularly handy if you re using SQL Server Express Edition, which

You can then access the values in the current row using the corresponding field names. The following example adds an item to a list box with the first name and last name for the current row: lstNames.Items.Add(myReader["au_lname"] + ", " + myReader["au_fname"]); To move to the next row, use the Read() method again. If this method returns True, a row of information has been successfully retrieved. If it returns False, you ve attempted to read past the end of your result set. There is no way to move backward to a previous row. As soon as you ve finished reading all the results you need, close the DataReader and Connection: myReader.Close(); myConnection.Close();

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To work with Ajax, JSON, and PHP, you need to know a little about JavaScript. For a moment, let s focus on some useful and required JavaScript libraries and functions. If you haven t done so already, download http://www.json.org/json.js now. You will need this script to use the examples in this chapter. This script provides the client-side encoding functions and an alternative parser to eval() that will throw exceptions, rather than client JavaScript errors, if it gets bad data. This script provides two key methods that enhance the JavaScript language itself: string type.toJSONString(): This method applies to most of the built-in JavaScript types. It will return a JSON-encoded string representing the data in the type. Listing 18-2 demonstrates its use. mixed string.parseJSON(filter): This method restores a JSON-encoded string to a JavaScript structure and will throw an exception if there is a problem decoding the data. Building on Listing 18-2, Listing 18-3 demonstrates how to decode a JSON-encoded value. Listing 18-2. JavaScript JSON Encoding <html> <head> <script src="json.js" type="text/javascript"></script> <script type="text/javascript"> function showJsonData() { original = new Array(0, 1, 2, 3); //Encode original in JSON returning a string. json = original.toJSONString(); div = document.getElementById("jsonData"); div.innerHTML = json; } </script> </head> <body> <a href="#" onclick="showJsonData()">Show JSON Data</a> <div id="jsonData"></div> </body> </html>

The next example demonstrates how you can use all the ADO.NET ingredients together to create a simple application that retrieves information from the Authors table. You can select an author record by last name using a drop-down list box, as shown in Figure 14-10.

gives you the ability to place databases directly in the App_Data folder of your web application (instead of placing all your databases in a separate, dedicated location). If Visual Studio finds a database in the App_Data folder, it automatically adds a connection for it to the Data Connections group. To learn more about this feature, check out the User Instance Connections section later in this chapter.

Figure 14-10. Selecting an author The full record is then retrieved and displayed in a simple label, as shown in Figure 14-11.

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