System.Object
   OpcLabs.BaseLib.Object2
      OpcLabs.BaseLib.Info
         OpcLabs.BaseLib.OperationModel.OperationArguments
            OpcLabs.BaseLib.OperationModel.HandleArguments
               OpcLabs.EasyOpc.DataAccess.OperationModel.DAHandleGroupArguments
            OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemArguments
               OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemGroupArguments
                  OpcLabs.EasyOpc.DataAccess.OperationModel.EasyDAItemSubscriptionArguments
                     OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemSubscriptionArguments<T>
               OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemValueArguments
                  OpcLabs.EasyOpc.DataAccess.Generic.DAItemValueArguments<TValue>
               OpcLabs.EasyOpc.DataAccess.OperationModel.DAItemVtqArguments
                  OpcLabs.EasyOpc.DataAccess.Generic.DAItemVtqArguments<T>
               OpcLabs.EasyOpc.DataAccess.OperationModel.DAReadItemArguments
            OpcLabs.EasyOpc.DataAccess.OperationModel.DANodeArguments
               OpcLabs.EasyOpc.DataAccess.OperationModel.DABrowseArguments
            OpcLabs.EasyOpc.DataAccess.OperationModel.DAPropertyArguments
         OpcLabs.BaseLib.OperationModel.OperationResult
            OpcLabs.BaseLib.OperationModel.ValueResult
               OpcLabs.BaseLib.OperationModel.Generic.ValueResult<T>
                  OpcLabs.EasyOpc.DataAccess.OperationModel.DANodeElementCollectionResult
            OpcLabs.EasyOpc.DataAccess.OperationModel.DAVtqResult
               OpcLabs.EasyOpc.DataAccess.Generic.DAVtqResult<TValue>
   System.EventArgs
      OpcLabs.BaseLib.OperationModel.OperationEventArgs
         OpcLabs.EasyOpc.DataAccess.OperationModel.EasyDAItemChangedEventArgs
            OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemChangedEventArgs<TValue>

Reference

OpcLabs.EasyOpcClassicCore Assembly