Public Delegate Function UpdateCertificateMethodStateMethodCallHandler( _
   ByVal context As ISystemContext, _
   ByVal method As MethodState, _
   ByVal objectId As NodeId, _
   ByVal certificateGroupId As NodeId, _
   ByVal certificateTypeId As NodeId, _
   ByVal certificate() As Byte, _
   ByVal issuerCertificates() As Byte, _
   ByVal privateKeyFormat As String, _
   ByVal privateKey() As Byte, _
   ByRef applyChangesRequired As Boolean _
) As ServiceResult

public delegate ServiceResult UpdateCertificateMethodStateMethodCallHandler( 
   ISystemContext context,
   MethodState method,
   NodeId objectId,
   NodeId certificateGroupId,
   NodeId certificateTypeId,
   byte[] certificate,
   byte[] issuerCertificates,
   string privateKeyFormat,
   byte[] privateKey,
   ref bool applyChangesRequired
)