Programming .NET Windows Applications
by Jesse Liberty, Dan Hurwitz

The unconfirmed error reports are from readers.  They have not yet been 
approved or disproved by the author or editor and represent solely the
opinion of the reader.

Here's a key to the markup:
        [page-number]: serious technical mistake
        {page-number}: minor technical mistake
        <page-number>: important language/formatting problem
        (page-number): language change or minor formatting problem
        ?page-number?: reader question or request for clarification

This page was updated September 16, 2004.


UNCONFIRMED  errors and comments from readers: 



{108}  pad = 11 - (sum % 11)  ditto page 110 for VB version;
'One-Off Error'

Your code allows values for Pad in the range 1 to 11, whereas the check digit is in
the range 0 - 10.

The solution is to set the Pad == 11 value to zero (which is correct in the written
check algorithm)

so, following the above line add:

Pad = Pad == 11 ? 0 : Pad;


{357}  Example 10-3 and the last paragraph;
I. Example 10-3 has the base.OnPaint(e) call as the last line in the derived
OnPaint() method. The call should be on the first line, else you run the risk of the
base routine interfering with what the derived routine does.
Note: Examples 10-4 and 10-5 do call the base routine on the first line.

II. The last paragraph, in describing both Examples 10-3 and 10-4, says: 
 The last line in the overridden method chains up to the base method...
it should say:
 The first line in the overridden method chains up to the base method...