public async Task <ActionResult> UpdateTrainer(int id)
{
try {
var entity = await _manager.GetTrainerById(id);
var tmp = await _manager.CreateListForViewCreateTrainer();
var tup = (entity, tmp);
return(View(tup));
}
catch (ArgumentNullException) {
return(RedirectToAction("ErrorPage", nameof(Main), new { message = "Error: can not find trainer with this id", call = nameof(Trainer) }));
}
catch (DbUpdateException) {
return(RedirectToAction("ErrorPage", nameof(Main), new { message = "Error: invalid input", call = nameof(Trainer) }));
}
}