title: Send Dropdownlist helper selected value to POST method
body: <p>I have this dropdown</p>
  
  <pre><code>@Html.DropDownList("pageSize",
        new SelectList(ViewBag.ListItems, "pageSize"), "pageSize",
        new
        {
              onchange = @"
              var form = document.forms[0];
              form.action='Home/Index';
              form.method='POST';
              form.submit();"
        })
  </code></pre>
  
  <p>based on the following ViewBag</p>
  
  <pre><code>ViewBag.ListItems = new List&lt;Int16&gt;
  {
        5,
        20,
        50,
        100
  };
  </code></pre>
  
  <p>All this placed over a html table in my Home Controller. I want to retrieve the amount of entries the user wants to see in my post method.</p>
  
  <pre><code>[HttpPost]
  public ActionResult Index(int? selectedOption, int? page, string pageSize)
  {
  }
  </code></pre>
  
  <p>How can I achieve this?</p>