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The strConn string variable stores the database connection string, which uses a local installation of SQL Server Express as indicated by the data source attribute. Then variables of type DataSet, SqlDataAdapter, and SqlConnection are declared. You must ensure that you have imported the System.Data and System.Data.SqlClient namespaces before you declare these variables. The Form_Load event handler of the form contains the code shown in Listing 7-4. Listing 7-4. Filling a DataSet private void Form1_Load(object sender, EventArgs e) { cnn = new SqlConnection(strConn); SqlCommand cmdEmployees = new SqlCommand(); cmdEmployees.CommandText = "SELECT * FROM employees"; cmdEmployees.Connection = cnn; da.SelectCommand = cmdEmployees; da.Fill(ds, "Employees"); FillEmployees(); } The code creates a SqlCommand object and sets its CommandText property to fetch all the records from the Employees table. The Connection property is set to the SqlConnection object created earlier. The SqlCommand object just created is assigned to the SelectCommand property of the SqlDataAdapter instance. The SelectCommand property determines the records to be populated in the DataSet later. Next, the Fill() method of the SqlDataAdapter is called. It takes two parameters: the DataSet to be filled and the name of the resultant DataTable. Notice that the code neither opens the connection nor closes it. This is so because the SqlDataAdapter class does that internally for us. Finally, a helper method, FillEmployees(), is called and fills the combo box with the list of employee IDs. The FillEmployees() method is discussed later.

To change this to implement the interface, you use the interface name as the third parameter, like this:

Portlets generally permit four types of authentication. Which of these has been used can be determined by calling getAuthType(). This method allows a portlet to determine the quality of the secure relationship and as a result to restrict the set of information that it will permit the user to access. In Basic authentication, the username and password are obtained from the web client (browser), which manages the mechanism of obtaining them from the user and submitting them to the server. The web browser sends the details as plaintext, so they are vulnerable to man-in-the-middle attacks.

SqlDataAdapter itself. If the connection is opened prior to calling the Fill() method, SqlDataAdapter

NOTE Man-in-the-middle attacks are a form of security attack where someone sets up a proxy server between an unknowing client and an unknowing server. The proxy server listens to requests from the user and records them. The requests are passed to the server, and the server returns a response to the proxy server. The proxy server also logs the response, and then passes the response back to the client. The man in the middle now has all of the user s requests and responses. If the browser has sent any sensitive information as unencrypted text, it is now compromised. The attacker may also alter the user s requests and responses.

Vehicles.SpeedBoat.registerClass('Vehicles.SpeedBoat', Vehicles.Boat, Vehicles.IPowered);

Client Certificate authentication requires the server and, optionally, the client to authenticate each another with public key certificates. The exchange is

When you select an employee ID from the combo box, the employee details should be displayed in the other text boxes. The relevant code is written in the SelectedIndexChanged event of the combo box and is shown in Listing 7-5.

overriding:

8

carried out over Secure Sockets Layer (SSL) to guarantee that it cannot be read if it is intercepted. Client Certificate authentication is managed by the web client. Digest authentication is about halfway between Basic and Client Certificate authentication. The username and password are not sent in plaintext; instead they are sent as a message digest, which prevents the password from being retrieved. However, as with basic authentication, the identity of the server is not verified and the exchange is carried out over an unsecured connection so there is still some degree of vulnerability.

Vehicles.SpeedBoat.prototype = { checkFuel: function(){ return "Yes, I use and need fuel, because I implement IPowered"; }, ... }