The correct answer is: A. SelectionModeProperty
The SelectionModeProperty is a property of a ListBox control that specifies how many items the user can select at a time. The possible values for this property are Single, Multiple, and Extended.
- Single: The user can select only one item at a time.
- Multiple: The user can select multiple items at a time.
- Extended: The user can select multiple items at a time, and the items can be arranged in a hierarchy.
The SelectionModeProperty is set using the SetSelectionMode method. The following code example sets the SelectionModeProperty of a ListBox control to Single:
listBox1.SelectionMode = SelectionMode.Single;
The SelectionModeProperty can also be set in the Properties window. To do this, open the Properties window for the ListBox control and select the SelectionMode property. Then, select the desired value from the drop-down list.
The SelectionModeProperty is a very important property of a ListBox control. It determines how the user can interact with the list of items. The correct value for the SelectionModeProperty depends on the specific application.
Option B, Select Property, is not a valid property of a ListBox control.
Option C, Check Property, is a property of a CheckBox control. It specifies whether the check box is checked or not.
Option D, IsSelect Property, is not a valid property of a ListBox control.