public static void SetSystemSoundsVolume(float level)
        {
            Interfaces.ISimpleAudioVolume volume = GetSystemSoundsVolumeObject();
            if (volume == null)
            {
                throw new Exception("No session found for system sounds");
            }

            Guid guid = Guid.Empty;

            volume.SetMasterVolume(level / 100, guid);
            Marshal.ReleaseComObject(volume);
        }
        public static void SetApplicationVolume(int pid, float level)
        {
            Interfaces.ISimpleAudioVolume volume = GetVolumeObject(pid);
            if (volume == null)
            {
                throw new Exception("No application found for pid");
            }

            Guid guid = Guid.Empty;

            volume.SetMasterVolume(level / 100, guid);
            Marshal.ReleaseComObject(volume);
        }