Errata

For question:
"You have derived a custom class from the Installer class. If the user cancels an installation, you need to run special code to remove changes you have made.

Which of the following Installer methods would you place the code in?"

The reference for this question points the reader to Chapter 9 Lesson 2. It should be Chapter 9 Lesson 3.

For Question:

"You are creating a custom installer manually rather than using the tools in Microsoft Visual Studio to generate an installer automatically."

The correct answer says "Override the OnInstall and OnCommit and OnRollback and OnUninstall Methods".

That is not right as the answer key itself says these methods do not exist.

The correct step is: "Override the Install, Commit, Rollback, and Uninstall methods."

The brief description of BinarySearch neglects to mention that the ArrayList must be sorted before BinarySearch is called. This contributes to the next problem on page 142.

The code examples do not produce the answer expected. In both the VB and C# samples, the code line al.Sort() needs to be inserted before the Console.WriteLine statement.

On page 143, in the first bullet under Dictionaries, "or index" should be removed.

Change:
"A dictionary of name/value pairs that can be retrieved by name or index"

To:
"A dictionary of name/value pairs that can be retrieved by name"

"NameValueCollection also provides similar functionality, but it allows you to use either a string or an integer index for the key" is incorrect.

A suggested change is: "The NameValueCollection represents a collection of string keys and string values."

First sentence reads: "Bind the shoppingCartList.ItemSource property...".
It should read "Bind the shoppingCartList.ItemsSource property...".

On page 223, the description of the ImageFormatConverter class is incorrect.

Change:

"Converts colors from one data type to another. Access this class through the TypeDescriptor object."

To:

"Converts ImageFormat objects from one data type to another. Access this class through the TypeDescriptor object."

Question 1, Answer D should read pc.IncrementBy(12), not pc.Increment(12)

CD ROM Readyness question :

You need to create a new text file.
Which of the following Visual Basic code samples does this correctly?
1. Dim tw As TextWriter = New TextWriter("output.txt", FileAccess.Write)
2. Dim tw As TextWriter = New TextWriter("output.txt")
3. Dim tw As TextWriter = File.CreateText("output.txt")
4. Dim tw As TextWriter = File.Open("output.txt")

Explanation:
You can create a new TextWriter object by calling the static File.Create or File.CreateText methods.

File.Open works only when accessing files that already exist.

TextWriter does not have a constructor that accepts parameters. Instead, you should define the instance using the File.Create
or File.CreateText static methods.
----
The ascertion that File.Open works only when access files that exist is wrong. File.Open an overload which accepts a System.IO.FileMode enum value - one of which is System.IO.FileMode.OpenOrCreate.

Intellisense says :
Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. If the file is opened with FileAccess.Read, System.Security.Permissions.FileIOPermissionAccess.Read is required. If the file access is FileAccess.Write then System.Security.Permissions.FileIOPermissionAccess.Write is required. If the file is opened with FileAccess.ReadWrite, both System.Security.Permissions.FileIOPermissionAccess.Read and System.Security.Permissions.FileIOPermissionAccess.Write are required. If the file access is FileAccess.Append, then System.Security.Permissions.FileIOPermissionAccess.Append is required.

To match the way SHA1 is used for example by Microsoft to validate that a ISO file download was successful, replace
Convert.ToBase64String(myHash.Hash)
with
System.BitConverter.ToString(myHash.Hash)

On page 740, the answer to Chapter 10, Lesson 2's Review question 1 is incorrect.

Change:

1. Correct Answers: B, C, and D

To:

1. Correct Answers: B and C

and Change:

D. Correct: The Increment method is thread-safe regardless of whether you pass a parameter.

To:

D. Incorrect: The Increment method, although thread-safe, is a parameterless method. However, you can pass a parameter to the thread-safe IncrementBy method.