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