creation of virtual PC using hyper v WMI

Hi,

Can any one help me increating a virtual Pc using hyper V WMI.I could get
some code base from MSDN but it am getting error at

ManagementScope scope = new ManagementScope(@"root\virtualization", null);
ManagementObject virtualSystemService =
Utility.GetServiceObject(scope, "Msvm_VirtualSystemManagementService");

inParams =
virtualSystemService.GetMethodParameters("DefineVirtualSystem");