check_expression - Is the expression to be checked for NULL. check_expression can be of any DMF supported types, Numeric, ...

check_expression - Is the expression to be checked for NULL. check_expression can be of any DMF supported types, Numeric, String, Bool, DateTime, Array and Guid. replacement_value - Is the expression to be returned if check_expression is NULL. replacement_value must be of a type that is implicitly convertible to the type of check_expression.