c# - MVC-4 Change ViewBag.Message on server side? -

i beginner in mvc coding.
when application starts, viewbag.message is: choose file upload.

after successful upload, changes to: file uploaded successfully!

is there way can make return , show "choose file upload" message again after around 5 seconds, without using javascript ? thought if mvc had built in time function use maybe ?

https://github.com/xoxotw/mvc_fileuploader

my view:

@{     viewbag.title = "fileupload"; }  <h2>fileupload</h2>  <h3>upload file:</h3>       @using (html.beginform("fileupload", "home", formmethod.post, new {enctype = "multipart/form-data"}))     {          @html.validationsummary();         <input type="file" name="filetoupload" /><br />         <input type="submit" name="submit" value="upload" />           @viewbag.message     } 

my controller:

using system; using system.collections.generic; using system.io; using system.linq; using system.web; using system.web.mvc;  namespace mvc_fileuploader.controllers {     public class homecontroller : controller     {         public actionresult index()         {             viewbag.message = "choose file upload!";             return view("fileupload");         }          [httppost]         public actionresult fileupload(httppostedfilebase filetoupload)         {              if (modelstate.isvalid)             {                 if (filetoupload != null && filetoupload.contentlength > (1024 * 1024 * 1))  // 1mb limit                 {                     modelstate.addmodelerror("filetoupload", "your file large. maximum size allowed 1mb !");                 }                  else                 {                     string filename = path.getfilename(filetoupload.filename);                     string directory = server.mappath("~/fileuploads/");                      if (!directory.exists(directory))                     {                         directory.createdirectory(directory);                     }                      string path = path.combine(directory, filename);                     filetoupload.saveas(path);                      modelstate.clear();                     viewbag.message = "file uploaded successfully!";                 }             }                  return view("fileupload");          }            public actionresult about()         {             viewbag.message = "your app description page.";              return view();         }          public actionresult contact()         {             viewbag.message = "your contact page.";              return view();         }     } } 

the short answer no. guessing because "new" want focus on mvc part mvc , javascript interlinked, think client (javascript) , server (mvc) , should master both make websites.

normally server doesn't fire events browser , instead browser make requests. there ways server raise events on client using things signalr overkill in scenario.

finally... trying achieve client-side action, i.e. inform user something. if did in mvc waste network bandwidth , add delays (think of server calls expensive) when client action , should done in javascript.

don't shy away javascript. embrace it. jquery takes lot of heavy lifting away you.