Gets or sets the string that specifies the display format for the value of the field. This property is not supported by the System.Web.UI.WebControls.CheckBoxField class.
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The CheckBoxField.DataFormatString property is inherited from the System.Web.UI.WebControls.BoundField class, but is not applicable to the System.Web.UI.WebControls.CheckBoxField class. Any attempt to access the value of this property will throw a NotSupportedException exception.