asp.net mvc - Display a bootstrap alert in a modal after submitting a form -

i work asp.net mvc 4 , have issue bootstrap modal. have modal form containing 4 dropdownlist (in partial view), when submit form action check in database if reference exist.

i want display alert in modal if reference doesn't exist without leaving modal, please tell me if possible , how ?

this part of view

@using (html.beginform("afficherbobine", "home")) { <div class="modal fade" id="choisirbobine" tabindex="-1" role="dialog" aria-labelledby="mymodallabel" aria-hidden="true">     <div class="modal-dialog">         <div class="modal-content">             <div class="modal-body">                 <div class="container-fluid">                     <section class="row">                         @html.partial("partialformbobine")                     </section>                     <section class="row">                      </section>                 </div>             </div>             <div class="modal-footer">                 <button type="button" class="btn btn-default" data-dismiss="modal">fermer</button>                 <button type="submit" class="btn btn-default">envoyer</button>             </div>         </div>     </div> </div> } 

and code of action :

[httppost]         public actionresult afficherbobine(string annee, string semaine, string montage, string numero)         {             string arg = annee + semaine + montage + numero;              idal dal = new dal();             //this code check if reference exist              sortedlist arg_params = new sortedlist();             arg_params.add("num_bobine", arg);             list<checkidentite> bobine = dal.retourneidentite(ref arg_params);              if (bobine.count != 0)             {                 return redirecttoaction("index", new { id = arg });             }             else             {                 //here code show alert ("wrong selection")             }         } 

thanks attention