GET and POST methods with the same Action name in the same Controller

Since you cannot have two methods with the same name and signature you have to use the ActionName attribute:

    [HttpGet]
    public ActionResult Index()
    {
        Some Code--Some Code---Some Code
        return View();
    }

    [HttpPost]
    [ActionName("Index")]
    public ActionResult IndexPost()
    {
        Some Code--Some Code---Some Code
        return View();
    }