ISBN-13 check in c#

  • Thread starter Thread starter diba1212
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diba1212

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how can i in C# this following ISBN-13 numbers Proof ?

"978-3-12-732320-7", Prüfziffer richtig

"9783960090724", Prüfziffer richtig

"978-3864902857", Prüfziffer richtig

"9783446437234", Prüfziffer richtig

"978-9-08-998815-0", Prüfziffer falsch

"978-9-08998716-7" Prüfziffer richtig

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