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ISBN-13 to ISBN-10
http://weblogs.asp.net/ fmarguerie/ archive/ 2007/ 12/ 23/ isbn-13-to-isbn-10.aspx
If for some reason you need to convert an ISBN-13 to ISBN-10 (one being that Amazon doesn't support ISBN-13 in product affiliate links) then you need not only to remove the first three characters. You also need to recompute the checksum. Here is a piece of code that I wrote to handle this conversion: public static String Isbn13to10(String isbn13) { if (String.IsNullOrEmpty(isbn13)) throw new ArgumentNullException("isbn13"); isbn13 = isbn13.Replace("-", "").Replace(" ", ""); if (isbn13.Length != 13) throw new ArgumentException("The ISBN doesn't contain 13 characters.", "isbn13");
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