public async Task <IActionResult> PutStandard([FromRoute] int id, [FromBody] StanderdClass standard)
 {
     if (!ModelState.IsValid)
     {
         return(BadRequest(ModelState));
     }
     if (id != standard.ClassId)
     {
         return(BadRequest());
     }
     try
     {
         _repo.Update(standard);
         var save = await _repo.SaveAsync(standard);
     }
     catch (DbUpdateConcurrencyException)
     {
         if (!StandardExists(id))
         {
             return(NotFound());
         }
         else
         {
             throw;
         }
     }
     return(NoContent());
 }
        public async Task <ActionResult> PostStandard([FromBody] StanderdClass standard)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }
            _repo.Add(standard);
            var save = await _repo.SaveAsync(standard);

            return(CreatedAtAction("GetStandard", new { id = standard.ClassId }, standard));
        }