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