System.Object
   Keysight.Visa.KeysightVisaEventArgs
   Keysight.Visa.ResourceManager
   Keysight.Visa.VisaConvert
   Keysight.Visa.VisaSession
      Keysight.Visa.GpibInterfaceSession
      Keysight.Visa.MessageBasedSession
         Keysight.Visa.GpibSession
         Keysight.Visa.SerialSession
         Keysight.Visa.TcpipSession
         Keysight.Visa.TcpipSocketSession
         Keysight.Visa.UsbSession
         Keysight.Visa.VxiSession
      Keysight.Visa.PxiBackplaneSession
      Keysight.Visa.RegisterBasedSession
         Keysight.Visa.PxiMemorySession
         Keysight.Visa.PxiSession
         Keysight.Visa.VxiMemorySession
      Keysight.Visa.VxiBackplaneSession

Reference

Keysight.Visa Assembly