How to pass the text/Value of an Html element from view to controller

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ASP.NET

MVC

I want to access the value of button in controller and then pass it to the view as well. But the value of "str" passed from view to controller is null.

@{
     var str = "Shoes";
  }

      <a href="~/Home/Products_By_Category/@str" target="_parent">
                <input type="button" value="Shoes" class="btn"/>
      </a>

<pre lang="c#">

     public ActionResult Products_By_Category(string s)
     {
           ViewBag.category = s;
           return View();
     }