public void AddVirtualNic(VMware.Vim.HostConfigManager configMgr, string portGroupName, string IPaddress, string subNetmask)
{
VMware.Vim.ManagedObjectReference nwSystem = configMgr.NetworkSystem;
HostVirtualNicSpec vNicSpec = new HostVirtualNicSpec();
HostIpConfig ipConfig = new HostIpConfig();
ipConfig.dhcp = false;
ipConfig.ipAddress = IPaddress;
ipConfig.subnetMask = subNetmask;
vNicSpec.ip = ipConfig;
vimService.AddVirtualNic(nwSystem != null ? new VimApi_55.ManagedObjectReference()
{
type = nwSystem.Type,
Value = nwSystem.Value
} : null, portGroupName, vNicSpec);
}