public async Task <ActionResult> Edit([Bind(Include = "ProductId,ItemId,OldProductId,OldItemId")] ProductItem productItem)
{
if (ModelState.IsValid)
{
var canChange = await productItem.canChange(db);
if (canChange)
{
await productItem.Change(db);
}
return(RedirectToAction("Index"));
}
return(View(productItem));
}