public virtual async Task <IActionResult> Delete(int id)
        {
            try
            {
                ApplicationUser user = await _userManager.GetUserAsync(HttpContext.User);

                Participant deletedDto = await _participantService.DeleteAsync(id, user, ModelState.AddModelError);

                if (deletedDto == null)
                {
                    return(BadRequest(ModelState));
                }
                return(Ok(deletedDto));
            }
            catch (EntityNotFoundException <Participant, int> )
            {
                return(NotFound());
            }
        }