Retrieves the value used for the field's value when rendering the System.Web.UI.WebControls.CheckBoxField object in a designer.
Always returns true.
The CheckBoxField.GetDesignTimeValue method is a helper method used to determine what value to display for a field when rendering the System.Web.UI.WebControls.CheckBoxField object in a designer. If real data can not be retrieved from the data source at design time, the value returned by this method is displayed instead.