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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.

D. Correct: This would be unnecessary because this feature is enabled by default, but it would allow System.Exception to catch both CLS-compliant and non-CLS-compliant exceptions. 3. Correct Answers: A, B, C and D A. Correct: All members of COM objects have to be implemented as instance members as opposed to static or shared members. In the .NET Framework, there is extensive use of shared/static members, so there stands to be a great behavior difference between objects created in each environment. B. Correct: COM does not provide support for parameterized constructors whereas the .NET Framework does. C. Correct: COM objects must be registered in the Windows registry. This is not available in other operating systems. D. Correct: COM flattens the inheritance chain and as such, places significant restrictions on what can be done with inheritance. 4. Correct Answers: A, C, and D A. Correct: This will allow you to view the Intermediate Language instructions issued after a COM component has been imported. B. Incorrect: While this tool is very powerful, it provides no facility to manage COM Interop. C. Correct: This tool will allow you to import COM components and change the name they ll be imported as. D. Correct: Since all COM components must be registered properly (which entails Windows registry entries), this tool enables you to view what has been entered into the Windows registry.

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As shown in the previous sections, StreamReader and StreamWriter are classes that make it simple to write to and read from text streams. That is the purpose of the reader and writer classes. The StreamReader class derives from the abstract TextReader class (by means of the MustInherit keyword in Visual Basic). The StreamWriter, not surprisingly, derives from the abstract TextWriter class. These abstract classes represent the basic interface for all text-based readers and writers.

For example, there is an additional text reader and writer pair called StringReader and StringWriter. The purpose of these classes is to write to and read from in-memory strings. For example, to read from a string using StringReader, you use code such as the following:

1. You have opened a command prompt, using Run As Administrator, with credentials in the Domain Admins group. You use the Dsrm command to remove an OU that had been created accidentally by James, a member of the Administrators group of the domain. You receive the response: Dsrm Failed: Access Is Denied. What is the cause of the error A. You must launch the command prompt as a member of Administrators to perform Active Directory tasks. B. Only Administrators can delete OUs. C. Only the owner of the OU can delete an OU. D. The OU is protected from deletion.

The following five levels of predefined security settings exist for security zones:

' VB Dim s As String = "Hello all" & _ Environment.NewLine & _ "This is a multi-line" & _ Environment.NewLine & _ "string" Dim rdr As New StringReader(s) ' See if there are more characters While rdr.Peek() <> -1 Dim line As String = rdr.ReadLine() Console.WriteLine(line) End While // C# string s = @"Hello all This is a multi-line text string"; StringReader rdr = new StringReader(s); // See if there are more characters while (rdr.Peek() != -1) { string line = rdr.ReadLine(); Console.WriteLine(line); }

In previous lessons of this chapter, you ve learned how to create users, groups, computers, and OUs and how to access the properties of those objects. Your ability to perform those actions was dependent on your membership in the Administrators group of the domain. You would not want every user on your help desk team to be a member of the domain s Administrators group just to reset user passwords and unlock user accounts. Instead, you should enable the help desk and each role in your organization to perform the tasks that are required of the role and no more. In this lesson, you ll learn how to delegate specific administrative tasks within Active Directory, which is achieved by changing the access control lists (ACLs) on Active Directory objects.

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