title: How to pass class via RedirectToAction
body: <p>I have the following code:</p>
  
  <pre><code>    public ActionResult Index()
      {
          AdminPreRegUploadModel model = new AdminPreRegUploadModel()
          {
              SuccessCount = successAddedCount,
              FailureCount = failedAddedCount,
              AddedFailure = addedFailure,
              AddedSuccess = addedSuccess
          };
          return RedirectToAction("PreRegExceUpload", new { model = model });
      }
  
      public ActionResult PreRegExceUpload(AdminPreRegUploadModel model)
      {
          return View(model);
      }
  </code></pre>
  
  <p>but model is null when I breakpoint on PreRegExcelUpload. Why?</p>