Which is not a valid value for the ListBox SectionMode Property?
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None
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One
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MultiSimple
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MultiExtended
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All of the above.
To determine the invalid value for the ListBox SectionMode Property, we need to understand what each option represents.
The SectionMode Property of a ListBox control determines how items are selected in the list. Here's an explanation of each option:
A. None: This option means that no items can be selected in the list. It is a valid value for the SectionMode Property.
B. One: This option means that only one item can be selected at a time in the list. It is a valid value for the SectionMode Property.
C. MultiSimple: This option means that multiple items can be selected in the list, but the selection is limited to a single contiguous range. It is a valid value for the SectionMode Property.
D. MultiExtended: This option means that multiple items can be selected in the list, and the selection can be non-contiguous. It is a valid value for the SectionMode Property.
E. All of the above: This option implies that all of the options mentioned (None, One, MultiSimple, and MultiExtended) are invalid values for the SectionMode Property. However, we have determined that all the options mentioned (A, B, C, and D) are valid values for the SectionMode Property.
Therefore, the correct answer is:
E. All of the above.
Marked correct: All of the above. This is confusing as posed: None, One, MultiSimple, and MultiExtended are in fact all genuine, valid values of a ListBox's SelectionMode property (as in .NET WinForms' SelectionMode enum). So none of the four individually is 'not valid' — meaning strictly there is no invalid value in the list, which makes 'All of the above' a poor fit for a question asking 'which is NOT valid,' since that phrasing would imply all four are simultaneously invalid, which is false. The question's premise doesn't cleanly support the marked answer.