IsDBNull methods indicate whether or not the specified attribute being retrieved is NULL.
Overload List:
IsDBNull(OracleConnection, IntPtr, string)
This method indicates whether or not the attribute being retrieved, specified by OracleConnection, pointer, and attribute name, is NULL.
IsDBNull(OracleConnection, IntPtr, int)
This method indicates whether or not the attribute being retrieved, specified by OracleConnection, pointer, and attribute index, is NULL.