Gets or sets a value indicating whether the System.Windows.Forms.ListBox supports multiple columns.
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A multicolumn System.Windows.Forms.ListBox places items into as many columns as are needed to make vertical scrolling unnecessary. The user can use the keyboard to navigate to columns that are not currently visible. Set the ListBox.HorizontalScrollbar property to true to display a horizontal scroll bar that enables the user to scroll to columns that are not currently shown in the visible region of the System.Windows.Forms.ListBox. The value of the ListBox.ColumnWidth property determines the width of each column.