Question 1

StreamReader inFile = new StreamReader("name.txt");
while ((inValue = inFile.ReadLine()) != null)
-Which of the following is an abstract class that cannot be instantiated?

Accepted Answer

The answer of StreamReader inFile = new StreamReader("name.txt");
while ((inValue =...

Question 2

Which exception is thrown when an attempt is made to access a file that does not exist?

Accepted Answer

The FileNotFoundException is thrown when an attempt to access a file that does not exist is made.

Question 3

When writing text files,if you add true to the constructor for the Append argument,____.

Accepted Answer

Adding "true" to the constructor for the Append argument allows for new lines of data to be added onto the end of an existing file.

Question 4

Which of the following class has public constructors?

Accepted Answer

The StreamReader class has public constructors, whereas Stream, TextReader, and File classes do not have public constructors.

Question 5

The StreamReader class extends the ____ class.

Accepted Answer

The StreamReader class extends the TextReader class, which provides a way to read a sequential stream of characters. It does not extend the File or FileInfo class, which provide information and manipulation of files and directories, or the IO class, which is a base class for all input/output (I/O) operations in .NET.

Question 6

In order to remove a StreamWriter object named writer,which is associated with a file in the project directory called "test.dta",you would write ____.

Accepted Answer

To remove the StreamWriter object associated with a file, we need to delete the file itself using the File.Delete() method. The correct parameter for this method is the file path, which is "test.dta" in this case. Therefore, the correct statement is File.Delete(writer).

Question 7

The FileDialog class has a property called ____,which is used by both the OpenFileDialog and SaveFileDialog classes to set or get the name of the file using a dialog box.

Accepted Answer

The property used by both OpenFileDialog and SaveFileDialog classes to set or get the name of the file using a dialog box is called FileName. Therefore, the correct choice is C) FileName.

Question 8

Which of the following is a static member of the Directory class?

Accepted Answer

The static member of the Directory class is Exists(). The other options are methods or properties of the class, but they are not static members.

Question 9

Which method is used to cause the dialog boxes to open?

Accepted Answer

ShowDialog() is commonly used to cause dialog boxes to open in various programming languages and environments, such as .NET and Java.

Question 10

The StreamWriter method(s)that clears all buffers for the current writer and causes any buffered data to be written to the underlying stream is ____.

Accepted Answer

The Flush() method clears all buffers for the current writer and causes any buffered data to be written to the underlying stream. This is a common practice to ensure that all the data written to the stream is saved before the stream is closed or disposed. The other methods mentioned are not used for this purpose. Write() and WriteLine() are used to write data to the stream, Close() is used to close the stream, and Dispose() is used to release the resources associated with the stream.

Question 11

The keyword ____ can be used to define a scope for an object such that the CLR automatically disposes of,or releases,the resource when the object goes out of scope.

Accepted Answer

The keyword "using" in C# can be used to define a scope for an object such that the CLR automatically disposes of, or releases, the resource when the object goes out of scope. This is called a "using block" and is commonly used for objects that implement the IDisposable interface, such as file streams and database connections. By using the "using" keyword, we can ensure that these resources are released even if an exception is thrown within the block.

Question 12

Parent and Root are two key properties of which class?

Accepted Answer

Parent and Root are properties of the DirectoryInfo class, which represents a directory on disk. Option A (FileInfo) represents a file, Option B (StreamReader) and Option D (TextReader) are classes used for reading textual contents from a file or a stream.

Question 13

The most appropriate programmer-defined enumeration identifier for a card's color that has field values of Red,Blue,Yellow,Black,and Green would be ____.

Accepted Answer

Option B, CardColor, is the most appropriate enumeration identifier for a card's color. It is specific, concise, and avoids any confusion with other aspects of the card. Option A, Card, is too general and does not convey the specific aspect of color. Option C, RedBlueYellowBlackGreen, is too long and violates naming conventions. Option D, 5Colors, is not specific enough and does not convey what the 5 colors are.

Question 14

Which method,used with the StreamWriter class,can be invoked to write characters to the stream,followed by a line terminator?

Accepted Answer

The WriteLine() method writes characters to the stream and adds a line terminator at the end.

Question 15

BinaryReader and BinaryWriter classes ____.

Accepted Answer

BinaryReader and BinaryWriter classes offer streaming functionality oriented toward binary data types, such as integers and floating-point numbers. They are commonly used to read and write binary data to and from files, network streams, and memory streams. They are not abstract classes and do not expose only static members, and while they can be used to read and write character strings, that is not their primary purpose.

Question 16

If a StreamReader object named reader is instantiated and associated with a file stored in the project directory named "test.dta",which of the following statements would check to see if the "test.dta" exists?

Accepted Answer

The answer of If a StreamReader object named reader is...

Question 17

Assume that an object of the DirectoryInfo is instantiated using the identifier dirListing.How could you retrieve the names of all files stored in dirListing that have a file extension of .cs?

Accepted Answer

Option A is the correct syntax to retrieve all files with .cs extension in the specified directory using the GetFiles() method with a file search pattern. Option B is incorrect because it only looks for files with the exact name "cs", not the extension ".cs". Options C and D are incorrect because they use the wrong class and method to search for files.

Question 18

Objects of streams can be wrapped with _________ objects to improve the speed and performance of file-handling operations.

Accepted Answer

BufferedStream objects can improve the performance of file-handling operations by adding a buffer memory that allows the stream to read or write data in larger chunks, reducing the number of times the underlying file system has to be accessed. NetworkStream, FileStream, and MemoryStream objects do not add this performance enhancement.

Question 19

StreamReader inFile = new StreamReader("name.txt");
while ((inValue = inFile.ReadLine()) != null)
-With the above code segment,how could you programmatically avoid having a FileNotFoundException or DirectoryNotFoundException exception thrown?

Accepted Answer

C  A) Invoking File.Exists() before the while loop checks if the file exists, preventing a FileNotFoundException.  C) Using a try...catch block can handle exceptions like FileNotFoundException or DirectoryNotFoundException if they occur.

Question 20

The gray section below the Form object where dialog objects are placed in Visual Studio is called the ____.

Accepted Answer

The gray section below the Form object where dialog objects are placed in Visual Studio is called the component tray, not the toolbox, dialog area, or work tray.

Quiz 13: Working with Files

StreamReader inFile = new StreamReader("name.txt") ; while ((inValue = inFile.ReadLine() ) != null) -Which of the following is an abstract class that cannot be instantiated?