public StorageSelector()
 {
     string classNameStr = (string)ConfigurationSettings.AppSettings["selectedStorageSQL"];
     Type concreteType = Type.GetType(classNameStr);
     //no-args costructor
     this.selected = (IHRHelperToolEngine)Activator.CreateInstance(concreteType);
 }
        //Interface for storage handles classes

        //to select particular storage class


        public StorageSelector(IHRHelperToolEngine selectedStorage)
        {
            this.selected = selectedStorage;
        }