How to call another controller Action From a controller in Mvc

I need to call a controller B action FileUploadMsgView from Controller A and need to pass a parameter for it.

 Code---its not going to the controller B's FileUploadMsgView().
    In ControllerA
  private void Test()
    {

        try
        {//some codes here
            ViewBag.FileUploadMsg = "File uploaded successfully.";
            ViewBag.FileUploadFlag = "2";

            RedirectToAction("B", "FileUploadMsgView", new { FileUploadMsg = "File   uploaded successfully" });
        }

     In ControllerB receiving part
  public ActionResult FileUploadMsgView(string FileUploadMsg)
    {
         return View();
    }