Checks whether the value from the specified column is NULL.
Visual Basic Public Overrides Function IsDBNull( _ ByVal columnID As Integer _ ) As Boolean
C# public override bool IsDBNull( int columnID );
columnID The ID number of the column. The value must be in the range [0,ULDataReader.FieldCount-1]. The first column in the cursor has an ID value of zero.
True if value is NULL, false if value is not NULL.
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