Question 1

With a simple combo box, the list drops down when the user clicks on the arrow and then disappears after a selection is made.

Accepted Answer

False

Question 2

Which of the following statements will remove all items from the list box?

Accepted Answer

The correct method to remove all items from a list box is by using the Items.Clear method. Option A is invalid syntax and Option B is a shortcut for calling the Items.Clear method. Option D would cause an error because the index of the items in the list box is zero-based, so the loop should go from 0 to lstBox.Items.Count - 1.

Question 3

For a list box named lstBox, the following statement will delete from its list the item whose index is the value num.

Accepted Answer

The statement to delete an item from a list box based on its index is lstBox.Items.RemoveAt(num).

Question 4

A list that has dropped down disappears when the user clicks on an item or presses the Enter key.

Accepted Answer

This is the default behavior of drop-down lists in most user interfaces. Once an item is selected or the Enter key is pressed, the list collapses and the selected item is displayed.

Question 5

The value of cboBox.Items(n) is the nth item in the combo box.

Accepted Answer

In many programming languages, including those used for GUI elements like combo boxes, indexing typically starts at 0. Therefore, cboBox.Items(n) would actually refer to the (n+1)th item in the combo box, not the nth.

Question 6

Which of the following expressions refers to the contents of the first row of the combo box?

Accepted Answer

The expression "cboBox.Items(0)" refers to the first item in the combo box, which is located in the first row.

Question 7

In a Simple combo box, the list is always visible.

Accepted Answer

In a simple combo box, the list is always visible.

Question 8

The value of cboBox.Text is the currently highlighted item.

Accepted Answer

The value of cboBox.Text is always the text of the currently highlighted item.

Question 9

If no item in a combo box is selected, the value of lstBox.SelectedIndex is 0.

Accepted Answer

When no item in a combo box (or list box) is selected, the value of `SelectedIndex` is -1, not 0. 0 would indicate that the first item in the list is selected.

Question 10

The statement lstBox.Items.RemoveAt(lstBox.SelectedIndex) deletes the item currently highlighted in lstBox.

Accepted Answer

The method RemoveAt(index) removes the item at the specified index in the lstBox. The SelectedIndex property indicates the index of the currently highlighted item in the list box, so using SelectedIndex as the input for RemoveAt will delete the currently highlighted item.

Question 11

For a list box named lstBox, the following statement will delete the first occurrence of the value of num from its list.

Accepted Answer

The statement provided is incomplete and does not specify the method or approach used to delete an item from the list box, making it impossible to determine if it would delete the first occurrence of the value of num.

Question 12

The number of items in cboBox is cboBox.Items.Count.

Accepted Answer

The property "Count" returns the number of items in the "Items" collection of the ComboBox control.

Question 13

Which of the following is the default setting for a combo box's DropDownStyle property?

Accepted Answer

The default setting for a combo box's DropDownStyle property is "DropDown," which allows the user to either select an item from the list or enter a new value.

Question 14

Which of the following controls does not have a DropDownStyle property that must be specified at design time?

Accepted Answer

ListBox is not a ComboBox control and therefore does not have a DropDownStyle property.

Question 15

The DropDownStyle property of a combo box must be set at design time.

Accepted Answer

The DropDownStyle property of a combo box can be set at design time in the properties window. It can also be changed programmatically during run time.

Question 16

The value of cboBox.Text is the contents of the text box at the top of the combo box.

Accepted Answer

This is correct. The cboBox.Text property returns the string value of the text that appears in the text box portion of the combo box control.

Question 17

Combo boxes have most of the same properties, events, and methods as list boxes.

Accepted Answer

Combo boxes and list boxes share many common properties, events, and methods as they are both used for displaying a list of items to the user. Some specific properties and events may differ between the two, but they have mostly similar functionality.

Question 18

Which of the following controls has a drop down arrow and an attached text box that allows users to type selections?

Accepted Answer

A DropDown ComboBox has a drop down arrow and an attached text box that allows users to type selections.

Question 19

Which of the following expressions refers to the contents of the last row of the combo box?

Accepted Answer

To select the last item in the combo box, we need to use the expression cboBox.Items(lstBox.Items.Count - 1). This is because the index of the last item in the combo box is one less than its total count, and we subtract one from the total count to get the index of the last item. Option A is incorrect because it refers to the contents of the last item in the list box, not the combo box. Option C is incorrect because there is no variable called Count in this scenario. Option D gives us the total count of items in the combo box, but it doesn't help us select the last item.

Question 20

For a scroll bar, the value of the Value property is

Accepted Answer

The Value property of a scroll bar should be a number between the values of the Minimum and Maximum properties, indicating the current position of the scroll bar. The SmallChange and LargeChange properties determine how much the position changes when the user interacts with the scroll bar. True or false is not a valid option for the Value property.

Quiz 9: Additional Controls and Objects