Response Unmarshaller for AssignVolume operation
Inheritance: JsonResponseUnmarshaller
 public static AssignVolumeResponseUnmarshaller GetInstance()
 {
     if (instance == null)
     {
         instance = new AssignVolumeResponseUnmarshaller();
     }
     return(instance);
 }
 public static AssignVolumeResponseUnmarshaller GetInstance()
 {
   if (instance == null)
   {
     instance = new AssignVolumeResponseUnmarshaller();
   }
   return instance;
 }