Gets or sets the number of columns to display in the System.Web.UI.WebControls.CheckBoxList control.
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When the CheckBoxList.RepeatLayout property is set to RepeatLayout.Table, you can use this property to specify the number of columns that display in the System.Web.UI.WebControls.CheckBoxList control. If this property is not set, the System.Web.UI.WebControls.CheckBoxList control displays all list items in a single column.