Gets the combined height of all items in the System.Windows.Forms.ListBox.
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This property enables you to determine the height that the System.Windows.Forms.ListBox needs to be sized to, in order to display every available item in the list and to avoid displaying vertical scroll bars. If the amount of items in the System.Windows.Forms.ListBox is large, sizing the control using the value of the ListBox.PreferredHeight property might cause the System.Windows.Forms.ListBox to be sized outside of the client area of the form or the System.Windows.Forms.ListBox container.