Identifies a value indicating whether the column contains null values.
bool IsDBNull( int ordinal )
ordinal: The zero-based column ordinal.
“True” if the specified column value is equivalent to DBNull; otherwise, “false.”
IDataRecord.IsDbNull
Call this method to check for null column values before calling the typed Get methods (for example, GetByte, GetChar, and so on) to avoid raising an exception.
