Getting Error: The message is not an HTTP POST for SAML .Net

Question

getting error in line number : 10      

 

you can find code in : https://www.componentspace.com/saml-for-asp-net

public ActionResult AssertionConsumerService() {
 bool isInResponseTo;
 string partnerName;
 string authnContext;
 string userName;
 IDictionary attributes;
 string relayState;

 SAMLServiceProvider.ReceiveSSO(
  Request,
  out isInResponseTo,
  out partnerName,
  out authnContext,
  out userName,
  out attributes,
  out relayState);
 Common.Email = userName;
 var applicationUserManager = HttpContext.GetOwinContext().Get();
 return RedirectToAction("ControllerMethod", "ControllerPage", new {
  value = userName
 });
}