Remove vDS form vmware vcenter

Two ESXI hosts connect with a vcenter app,and create a vDS between the hosts.

When I want to remove the vDS in the vcenter tab, it is hard to complete and promote an’The device is in use’ warning to me.

Actually the correct way to fix this problem is remove the vDS  VMNIC which attach with the physical NIC adapter.

1.vcenter>>go to HOST view>>configure>>network>>vmkernal>>remove the attach NIC >>remove vDS

2.vcenter>>go to NETWORK tab>>remove the vDS

3.system log will show the operation are well done.