ReWriteURL and Redirect in net core 2.1

Container:
public class HomeController : Controller
    {
        public IActionResult Index()
        {
          //1 and 2 are without changing the URL in broswer
          //1. HomeController aController = new HomeController();
                return aController.About();
          //2.//"PageNotFound" must be in Shared view folder.
              return View("PageNotFound").
         //3 other changing the URL
                return View("Calls");
                Response.Redirect("c");
                return View("Go");
                Redirect("t"); 
                RedirectToAction(...);
        }
}

Environment:
    <PackageReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />

Ref:
http://www.advancesharp.com/questions/100/server-transfer-in-mvc-razor