How to add success message after HttpPost submits database changes - asp.net-mvc

Question

I have an HttpPost method that add to the database
public ActionResult SubmitData(MyViewModel model)
{
if (ModelState.IsValid)
{
var result = submitData(command);
if (response.success)
{
return RedirectToAction("MyHttpGetMethod");
}
}
return View("MyHttpGetMethod", model);
}
public ActionResult MyHttpGetMethod(int Id)
{
MyModel model = GetData(Id);
return View(model);
}
After the HttpPost is called and the database changes are made successfully, I redirect to
the HttpGet action to get the current data after the changes. I like to display a success message
on the View. I can't use ViewBag because of the Redirect and I can't use TempData, because it's not recommended here.

Answer 1

TempData is a valid solution for this specific use case. But if you do not prefer to do that, you can pass a querystring value to indicate the status of the transaction from your HttpPost action to the GET action.
So update your GET action to have another paramter
public ActionResult MyHttpGetMethod(int Id,string m="")
{
MyModel model = GetData(Id);
if(!String.IsNullOrEmpty(m) && m=="s")
{
// do some code to show the success message here.
ViewBag.Msg="Saved Successfully";
}
return View(model);
}
and in your view, use the ViewBag item to show the message (with whatever styles you want)
<p>#ViewBag.Msg</p>
and in your HttpPost action,
return RedirectToAction("MyHttpGetMethod", new { id =model.Id, m="s"} );