How to Get Selected Radio Button Value on Action in ASP.NET MVC

View
  1. @using (Html.BeginForm("Index", "Demo"))  
  2. {  
  3.        @Html.RadioButton("Answer", "A") <span>A</span>   
  4.        @Html.RadioButton("Answer", "B") <span>B</span>   
  5.   
  6.     <input type="submit" value="Next" />  
  7. }  
Controller
  1. [HttpPost]  
  2. public ActionResult Index(string Answer)  
  3. {  
  4.     return View();  
  5. }