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Localized version

Μπορεί να υπάρχει μόνο μία παρουσία DBNull και δεν επιτρέπονται οι κλήσεις σε μεθόδους αποσειριοποίησης DBNull.
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English version

Only one DBNull instance may exist, and calls to DBNull deserialization methods are not allowed.
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Localized version
 Greek

Error category
 .Net Framework

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