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A quiet zone is an area of blank space on either side of a barcode that tells the scanner where the symbology starts and stops.
public QuietZone QuietZone { get; set; }
Public Property QuietZone As QuietZone
If the quiet zone is empty and AutoSize is true, the default value will be used for the specified barcode. The default value depends on the CodeType, for example, QRCode have a quiet zone of four blocks wide, while DataMatrix have quiet zone of only one block wide.