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Answers
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Correct Answers: B and D A. Incorrect: While you could launch an assembly automatically by adding it to the Startup group, you cannot launch a service this way. B. Correct: You can use the InstallUtil command-line tool to install a service manually. C. Incorrect: While you could launch an assembly automatically by adding it to Scheduled Tasks, you cannot launch a service this way. D. Correct: The most user-friendly way to install a service is to use Visual Studio to create an installer for your service.
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Correct Answer: B A. Incorrect: My Computer does not contain a tool to configure user accounts for services. B. Correct: Computer Management contains the Services snap-in, which you can use to configure user accounts for services. C. Incorrect: While you can use the Net command-line tool to start, stop, pause, and continue service, you cannot use Net to configure user accounts for services. D. Incorrect: The Microsoft .NET Framework 0 Configuration tool does not contain a tool to configure user accounts for services.
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8: Case Scenario Answers
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Case Scenario 1: Creating a Testing Tool
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1. You should create an application that prompts the user to select a zone and an assembly. Based on their selections, you should launch the assembly in an application domain with evidence that would cause it to be assigned to the code group corresponding to the selected zone. 2. Although several techniques would work, the simplest way to do this is to assign Internet zone evidence to the assembly, as the following code demonstrates:
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' VB Dim hostEvidence As Object() = {New Zone (SecurityZone.Internet)} Dim internetEvidence As Evidence = New Evidence (hostEvidence, Nothing) Dim myDomain As AppDomain = AppDomain.CreateDomain("QADomain") myDomain.ExecuteAssembly("C:\path\CASDemands.exe", internetEvidence)
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Answers
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// C# object [] hostEvidence = {new Zone(SecurityZone.Internet)}; Evidence internetEvidence = new Evidence(hostEvidence, null); AppDomain myDomain = AppDomain.CreateDomain("QADomain"); myDomain.ExecuteAssembly(@"C:\path\CASDemands.exe", internetEvidence);
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When the CASDemand application runs, the runtime should warn you that the application is running in a partially trusted context. If you do not receive this warning, you have not successfully restricted the assembly s permissions.
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Case Scenario 2: Monitoring a File
1. You should create a Windows Service. 2. You will need to create a setup project for the service. The setup project will generate an MSI file that IT can distribute by using Systems Management Server (SMS). 3. You should set the startup type to Automatic. 4. You should specify the User account type, and ask the IT department to create a user account that has only privileges to read the configuration file and add events. LocalService would not have sufficient privileges, and LocalSystem would have excessive privileges.
9: Lesson Review Answers
Lesson 1
1. Correct Answer: D A. Incorrect: Although the overall approach is correct, Hello World is the value that s being retrieved, not the key. Using the configuration file shown, this line of code would return a null object because there is no Key value of Hello World . B. Incorrect: Although AppSettings will technically work, it s obsolete and cannot be guaranteed to be supported in future releases. Using this approach will result in a compiler warning and, depending on the build settings, might not even compile. C. Incorrect: The overall approach is correct here; however, there is only one value in the configuration file. The index references here is 5. There aren t 5 objects in the collection, so using this line of code will result in a null reference.
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D. Correct: The AppSettings property of the ConfigurationManager object will return a NameValueCollection. This collection can be referenced by Key. There is a Key for Foo , and using this approach will return the value Hello World . 2. Correct Answer: D A. Incorrect: There is no section named SqlConnectionStrings, so this code will result in a failure. B. Incorrect: Using the <clear/> tag is the only safe way to approach this scenario. As such, if any other connection strings are already stored or if the file has already been read, there won t be a problem with duplicate keys. C. Incorrect: There is no SqlConnectionString property in the ConfigurationManager object. D. Correct: As mentioned, there is no SqlConnectionStrings property of the ConfigurationManager object. For this code to work, connectionStrings would need to be used instead. 3. Correct Answer: D A. Incorrect: The IConfigurationSectionHandler is a viable interface for implementing custom configuration section management. However, ApplicationSettingsBase is the most appropriate choice. B. Incorrect: The ConfigurationValidatorBase is used to validate values in a configuration file. It s not used for implementation. C. Incorrect: The IConfigurationSystem interface is intended for use internally by the .NET Framework and should not be used directly. D. Correct: The ApplicationSettingsBase object is a valid way to handle custom configuration and, in many ways, is a preferred object to use.
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