IFrame Error Replicatice in the Iframe

Question

The Issue is when ever i click to the Dashboard icon or i click to the logout button it replicate in the iframe 

 

i am done this through this article .. i am setting the logout function in 

 

public ActionResult Logout()

{

return RedirectToAction("after_logout");

}

public ActionResult after_logout()

{

/Response.Redirect("/Home/Index");

// return View();

}

 

It redirects me but Again my Index page Open in Iframe