public async Task <IActionResult> Remove(int id)
        {
            var trade = await _context.Trades.FirstOrDefaultAsync(t => t.Id == id);

            if (trade == null)
            {
                return(NotFound());
            }
            try
            {
                _context.Remove(trade);

                await _context.SaveChangesAsync();
            }
            catch (DbUpdateException)
            {
                //Log the error (uncomment ex variable name and write a log.
                ModelState.AddModelError("", "Unable to save changes. " +
                                         "Try again, and if the problem persists " +
                                         "see your system administrator.");
            }
            return(RedirectToAction(nameof(Index)));
        }