使用WMI ChangeZoneType将DNS区域从辅助更改为主要

Has anyone used the WMI ChangeZoneType DNS command in C#\VB.net before. I get an incorrect parameter exception when i try and invoke the changezonetype command. I get the dns zone that i want to change from the dns server (via query), set the zonetype to the appropriate uint value but am then getting the exception. I am trying to change the zone from secondary to primary and according to Has anyone used the WMI ChangeZoneType DNS comm