Auto Checkdigit check box

When this option is checked dBarcode automatically calculates the checksum digits of the code. Consequently checksum digits should not be entered by the user when this item is checked. dBarcode will modify the number that appears as Characters Required when the Auto Checkdigit option is checked.

Note that for Code 128 and EAN-128 the checksum calculation is always automatic and the resulting characters are not displayed in human readable form. These features are specified by the EAN-128 standard.

More:

Show Checkdigit check box