Question 1

Controls that display text have a ____________ property that allows you to change the color of the text.

Accepted Answer

The ForeColor property is used to change the color of the text in a control, making it easier to read or more visually appealing. TextColor, FontColor, and Color are not valid properties for changing text color in most programming languages.

Question 2

A ____________ control is a rectangular container for other controls.

Accepted Answer

A panel control is a rectangular container for other controls. It is often used to group controls together and to organize them on a form. While GroupBox is also an option, it specifically includes a border and a caption, whereas a Panel can be customized more extensively. ComboBox and ListBox are both drop-down list controls and not meant for grouping other controls together.

Question 3

You can use the ____________ formatting strings with integers to specify the minimum width for displaying the number.

Accepted Answer

The "D" or "d" formatting strings are used with integers to specify the minimum width for displaying the number, ensuring that the output aligns correctly for numbers of varying lengths.

Question 4

____________ ("E" or "e") displays numeric values in scientific notation.

Accepted Answer

Exponential format displays numeric values in scientific notation, where "E" or "e" represents the power of 10. For example, 1.23E+4 would be displayed as 12,300 in exponential format.

Question 5

When you pass the formatting string ____________ to the ToString method, the number is displayed with comma separators and a decimal point.

Accepted Answer

The formatting string "N" or "n" is used to display a number with comma separators and a decimal point. The number of decimal places displayed can be specified by adding a number after the "N" or "n".

Question 6

In code, you move the input focus to a control by calling the ____________ method.

Accepted Answer

The correct method to move the input focus to a control is the Focus method. This method sets the focus on the specified control, allowing the user to interact with it via keyboard or other input devices. The Tab method is used to move the focus to the next control in the tab order, but it may not set the focus on a specific control as requested. Selection method is used to access the selected portion or content of a control or textbox. The Move method is not a valid method in this context.

Question 7

When you call the ToString method, you can optionally pass a(n) ____________ as an argument to the method to indicate that you want the number to appear formatted in a specific way when it is returned as a string from the method.

Accepted Answer

The correct term for the argument passed to the ToString method to format the number is a formatting string. This string contains placeholders and formatting codes that determine how the number should appear in the resulting string. For example, you could pass the formatting string "C" to ToString to format the number as a currency value with the appropriate currency symbol and decimal places. Other formatting codes include "D" for decimal, "E" for exponential, and "F" for fixed-point.

Question 8

Code that responds to exceptions when they are thrown and prevents the program from abruptly crashing is called a(n) _____________.

Accepted Answer

Exception handling involves catching exceptions and taking appropriate actions to prevent program crashes or errors. The code that handles exceptions is commonly referred to as an exception handler. Choice A (catch-all) is incorrect because not all exceptions should be caught and handled in the same way. Choice B (debugger) is incorrect because a debugger is a tool used for finding and fixing code errors, not for handling exceptions. Choice D (critical state handler) is not a commonly used term in programming and does not accurately describe the concept of exception handling.

Question 9

____________ ("P" or "p") causes the number to be multiplied by 100 and displayed with a trailing space and % sign.

Accepted Answer

The percent format is specifically designed for displaying numbers as percentages and involves multiplying the number by 100 and including a trailing space and % sign. The other formats listed do not involve percentage calculations or formatting.

Question 10

You can call the ToString method using the following general format:

Accepted Answer

The ToString method is called by appending it to the variable name using a dot notation. Therefore, the correct format is variableName.ToString().

Question 11

When using the ____________ operator, if one operand is a number and the other operand is a string, the number will be implicitly converted to a string, and both operands will be concatenated.

Accepted Answer

The + operator is the only one that performs concatenation of strings and numbers. The other operators (*, /, &) have different functions and do not perform concatenation in the same way.

Question 12

The ____________ property lets you designate a button on a form that will be automatically clicked when the user presses the Esc key.

Accepted Answer

The CancelButton property can be set to the name of a button control on the form, and when the user presses the Esc key, the button's Click event will be fired automatically, providing a way for the user to cancel an operation or close a dialog box. There is no property called ExitButton, EscapeButton, or StopButton in C#.

Question 13

A(n) ____________ also known as a mnemonic, is a key pressed in combination with the Alt key to trigger a Click event.

Accepted Answer

Access keys or mnemonics are keyboard shortcuts that use the Alt key in combination with a letter or number key to trigger a Click event. They provide keyboard access to frequently used controls, improving the accessibility and usability of an application or website.

Question 14

When an exception is thrown, an application stops running and Visual Studio goes into a special mode known as ____________.

Accepted Answer

When an exception is thrown, Visual Studio goes into break mode, which allows the developer to inspect the code and diagnose the issue that caused the exception. Debug mode is a broader term that can refer to the process of finding and fixing programming errors in general, whereas break mode specifically refers to the mode that Visual Studio enters when an exception is thrown. Exception mode and validation mode are not actual modes in Visual Studio.

Question 15

Most controls have a ____________ property that allows you to change the object's background color.

Accepted Answer

The BackColor property is the one commonly used to set the background color of a control. Options A, B, and D are not valid properties in most programming environments.

Question 16

____________ ("F" or "f") displays numeric values with no thousands separator and a decimal point.

Accepted Answer

The Fixed-Point format displays numbers with fixed decimal points, without using thousands separators. It is identified by the "F" or "f" format specifier.

Question 17

In C#, an exception handler is written with the ____________ statement.

Accepted Answer

In C#, an exception handler is written with the try-catch statement, where the try block contains the code that might generate an exception, and the catch block handles the exception.

Question 18

The ____________ property lets you designate a button on a form that will be automatically clicked when the user presses the Enter key.

Accepted Answer

The AcceptButton property lets you designate a button on a form that will be automatically clicked when the user presses the Enter key. Option A (ConfirmButton) is not a valid property. Option C (EnterButton) is not a valid property. Option D (DefaultButton) is a valid property but it does not automatically click the button on pressing Enter key.

Question 19

When you pass the formatting string ____________ to the ToString method, the number is returned formatted as currency.

Accepted Answer

The formatting string "C" or "c" is used for formatting numbers as currency.

Question 20

A ____________ control is a rectangular control that appears with a thin border and an optional title in its upper-left corner.

Accepted Answer

A GroupBox control is specifically designed to group related controls in a rectangular shape with a thin border and an optional title in its upper-left corner. This makes it the best choice for the given description. A Panel control is similar but lacks the optional title in the upper-left corner. A ComboBox and ListBox are both drop-down list controls and do not fit the description.

Quiz 3: Processing Data