MVC passing parameter on post to controller

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MVC

i am very new to MVC

i need some help to over come the issue of passing parameter to a controller on form submit

what i have got is the following controller and the view

[HttpGet]
        public ActionResult Index()
        {
            return View(_bag.GetBag);
        }
        [HttpPost]
        public ActionResult Index(string method ="None" )
        {
            
                switch (method)
                {
                    case "Add10":
                        _bag.GetBag = Get100Products().Take(10).ToList<Product>();
                        break;
                    case "Clear":
                        _bag = null;                       
                        _bag = new Models.Bag();
                        break;
                    case "Add":
                        if ((Request.Form["Id"] != null) && (Request.Form["Id"] != ""))
                        {
                            if (_bag.GetBag.Count < 100)
                            {
                                var p = GetProduct(Request.Form["Id"]);
                                int qnt = Convert.ToInt16(Request.Form["qnt"]);
                                if (p.ItemNumber != null)
                                {
                                    p.Quantity = qnt;
                                    p.Index++;
                                    _bag.Item = p;
                                }
                            }
                        }
                        break;

                       

                
            }
                return View(_bag.GetBag);
        }

and the view part of the view

<div style="vertical-align:middle">

@using (Html.BeginForm("", "Home", new { method = "Add10" }, FormMethod.Post))
{
<!-- form goes here -->

 <input type="submit" value="Add 10 Items to bag" />

}

 @using (Html.BeginForm("GetDiscount", "Home", FormMethod.Post))
{
 <div>
 <!-- form goes here -->

  <input type="submit" value="Get Discount" />
    With MAX time in seconds  <input type="text" name="time" maxlength="2" value="2" />

  </div>
}


@using (Html.BeginForm("", "Home", new { method = "Clear" }, FormMethod.Post))
 {
   <input type="submit" value="Empty the bag" />
 }
</div></form> 

so i am expecting when the use clicked button Add 10 Items to bag to pass the method value "Add10" to the index controller and when clicked Empty the bag to pass "Clear" the method value in index controller

but it always shows as "None"

what i have done wrong appreciate all your help

thanks