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Tables are the building blocks for every database and are used to store all the data in SQL Server. To provide the necessary structure to a table, choices must be made between the available numeric, text, datetime, and binary data types so that data can be properly stored. After a table is defined, you must grant permis sions on the table in order to allow users to retrieve and manipulate data. Constraints are used to enforce additional business rules within a table. They can be used to ensure that duplicate values cannot be entered into a column, or that a column can only allow values that meet a specified condition. Constraints can be used to enforce complex pattern matching, like the vehicle identification number (VIN) that is used to uniquely identify every vehicle. Constraints can also be created to ensure that a value cannot be entered in one table unless it

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they may follow your modules or even features. For example, if you follow your application layers, you may have a UserInterface component, a BusinessObjects component, and so on. Or you may decide to break out some of these layers into multiple components. You may create a EngagementManager component, an Invoice component, and so on. Each of these may contain business logic for a given module. However, this physical distribution may be based on the choice to encapsulate each module of the application.

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1. Correct Answer: B A. Incorrect: The retention parameter specifies whether to keep messages until the conversation that processed them has been explicitly closed or whether to discard the messages as soon as they are processed. B. Correct: Activation causes a stored procedure to be launched when a new messages arrives on a queue, as long as a stored procedure is not already running. This feature will launch additional procedures up to a configured maximum if the rate of inbound messages exceeds the rate at which they are being processed. C. Incorrect: The MAX_QUEUE_READERS option limits the number of procedures that are activated but does not activate them to process messages. D. Incorrect: The stored procedure that is specified for activation processes messages on the queue and does not launch new instances of itself. 2. Correct Answers: C and D A. Incorrect: A contract defines the message types that are allowed. B. Incorrect: A dialog is a type of conversation that specifies the services to use along with the contracts to use that are defined for those services. C. Correct: A queue is defined for each service, specifying the endpoint for a conversation. D. Correct: One or more contracts are defined for the service to restrict the types of conversations in which the service can participate.

Figure 7-21: Asking for or offering remote assistance Not only must the person providing remote assistance receive an invitation, but she also needs to provide a password that can be given to her only by the person requesting assistance, as shown in Figure 7-22. For security reasons, this password should be provided using a different method to the one used to transmit the invitation file. If the user requesting remote assistance closes the Windows Remote Assistance dialog box, it is not possible for the remote user to make a connection, even if the invitation period has not expired. Once this dialog box is closed, Windows Remote Assistance needs to be restarted and a new remote assistance invitation issued because the previous one is no longer valid.

' VB Public Sub New() MyBase.New() InitializeComponent() ' Create a WindowsIdentity object representing the current user Dim currentIdentity As WindowsIdentity = WindowsIdentity.GetCurrent() ' Create a WindowsPrincipal object representing the current user Dim currentPrincipal As WindowsPrincipal = _ New WindowsPrincipal(currentIdentity) ' Set the security policy context to Windows security System.AppDomain.CurrentDomain.SetPrincipalPolicy( _ PrincipalPolicy.WindowsPrincipal) ' Hide the subtract and multiply buttons if the user ' is not an Administrator If Not currentPrincipal.IsInRole(WindowsBuiltInRole.Administrator) Then subtractButton.Visible = False multiplyButton.Visible = False End If ' Hide the Add button if the user is not in the Users group If Not currentPrincipal.IsInRole(WindowsBuiltInRole.User) Then addButton.Visible = False End If ' Hide the Divide button if the user is not named CPhilp If Not (currentIdentity.Name.ToLower() = _ System.Environment.MachineName.ToLower() + "\cphilp") Then divideButton.Visible = False End If End Sub // C# public Form1() { InitializeComponent(); // Create a WindowsIdentity object representing the current user WindowsIdentity currentIdentity = WindowsIdentity.GetCurrent();

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