https://learn.microsoft.com/en-us/dotnet/api/system.directoryservices.activedirectory.domain.updatetrustrelationship?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
Domain.UpdateTrustRelationship(Domain, TrustDirection) Method...
Updates the trust direction for an existing trust relationship. The trust directions are updated on both sides of the trust.
domainmethod