public async Task <ActionResult> EditPatient(int?id)
        {
            if (id == null)
            {
                return(NotFound());
            }
            var pat = await _patient.Get(id);

            if (pat == null)
            {
                return(NotFound());
            }
            ViewData["BloodGroupId"] = new SelectList(_context.BloodGroup, "Id", "Name");
            return(View(pat));
        }