how to retrieve dvs name from DVS Destroyed event

ManagedObjectReference mordvs = dvsDestroyedEvent.getDvs().dvs;

String mor_type = mordvs.getType();

DistributedVirtualSwitch dvs = null;

dvs = (DistributedVirtualSwitch) MorUtil.createExactManagedEntity(si.getServerConnection(), mordvs);

String dvsName = dvs.getName();

dvs.getName() is throwing exception as

Caught Exception :  Name : java.lang.RuntimeException Message : com.vmware.vim25.ManagedObjectNotFound: VmwareDistributedVirtualSwitch:dvs-122 Trace