AWS SDK for .NET Documentation
AllowMajorVersionUpgrade Property
AmazonAmazon.RDS.ModelModifyDBInstanceRequestAllowMajorVersionUpgrade Did this page help you?   Yes   No    Tell us about it...
Indicates that major version upgrades are allowed. Changing this parameter does not result in an outage and the change is asynchronously applied as soon as possible. Constraints: This parameter must be set to true when specifying a value for the EngineVersion parameter that is a different major version than the DB instance's current version.
Declaration Syntax
C#
public bool AllowMajorVersionUpgrade { get; set; }

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)