Web Reference: Aug 26, 2008 · If you aren't using nullable types, the best thing to do is check to see if the column's value is DBNull. If it is DBNull, then set your reference to what you use for null/empty for the corresponding datatype. Safely handle DBNull values in C# when querying databases like Oracle or SQL Server. Prevent InvalidCastExceptions with practical examples and extension methods. The DBNull.Value member represents the sole DBNull object. DBNull.Value can be used to explicitly assign a nonexistent value to a database field, although most ADO.NET data providers automatically assign values of DBNull when a field does not have a valid value.
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