Interleaved 2 of 5 is a high-density numeric-only bar code. It requires an even number of digits.

 
• The check digit may be added to the barcode and/or text by setting the OptionalCheckChar property to Barcode_Only or Barcode_And_Text.  The number of total digits in the barcode, including the check digit, must be even.
• Bearer bars may be added by using the BearerBars property.

• Symbology property