Question

Code below:

[HttpGet]
public ActionResult Edit(string id="")
{
    // ...
}

[HttpPost]
public ActionResult Edit(string itemId="", EditViewModel viewModel)
{
    // ...

    RedirectToAction("Edit", new { id = itemId });
}

returns an error: "Optional parameters must appear after all required parameters".

I assume it’s trying to redirect to [HttpPost] action.

How to redirect to [HttpGet] action?

I’m trying to implement Save functionality where it will save the edit and reload the form with new values.

Answer 1

Error message is clear…

… if you know that an optional parameter is a parameter with a default value (empty string in your case)

[HttpPost]
public ActionResult Edit(EditViewModel viewModel, string itemId="")
{
    // ...

    RedirectToAction("Edit", new { id = itemId });
}

and you’re done