public async Task <IActionResult> OnGetAsync(int?experimentId, int?participantId)
        {
            if (experimentId == null)
            {
                return(NotFound());
            }

            ExperimentParticipant = await _context.ExperimentParticipant
                                    .Include(e => e.Experiment)
                                    .Include(e => e.Participant)
                                    .Where(m => m.ExperimentId == experimentId)
                                    .Where(m => m.ParticipantId == participantId)
                                    .SingleOrDefaultAsync();

            if (ExperimentParticipant == null)
            {
                return(NotFound());
            }
            return(Page());
        }
        public async Task <IActionResult> OnPostAsync(int?experimentId, int participantId)
        {
            if (experimentId == null)
            {
                return(NotFound());
            }

            ExperimentParticipant = await _context.ExperimentParticipant
                                    .Include(e => e.Experiment)
                                    .Include(e => e.Participant)
                                    .Where(m => m.ExperimentId == experimentId)
                                    .Where(m => m.ParticipantId == participantId)
                                    .SingleOrDefaultAsync();

            if (ExperimentParticipant != null)
            {
                _context.ExperimentParticipant.Remove(ExperimentParticipant);
                await _context.SaveChangesAsync();
            }

            return(RedirectToPage("./Index"));
        }