asp.net mvc - MVC Ajax BeginForm validation -

i have bootstrap modal makes insert. using ajax beginform , have problem validation. normal validation like: required fields works great. problem have server validation , when goes controller , not pass custom validation tried return partialview model or json not able trigger validation on modal. googled lot , not able solve problem.

here code

public class contactdto {     public decimal idcontact{ get; set; }     public decimal? counterpartyid { get; set; }     public string name { get; set; }     public string address { get; set; }     public string city { get; set; }    } 

controller:

[httppost] [validateantiforgerytoken] public jsonresult editcontact(contactdto contact) {     if (customvalidation(code) && modelstate.isvalid)     {         _dbmanager.createcode(code);          //return redirecttoaction("details", "counterparties", new { id = code.codecounterpartyid });         return json(new { data = "ok" }, jsonrequestbehavior.allowget);     }      return json(new { data = "nok" }, jsonrequestbehavior.allowget); } 

modal ajax:

@using system.globalization @model updatetabs.models.contactdto  <div id="editcontactmodaldiv" class="modal fade" role="dialog">     <div class="modal-dialog modal-lg">      .......          @using (ajax.beginform("editcontact", "home", new ajaxoptions { httpmethod = "post", onsuccess = "validatekeys"}, new { id = "formcreatecontact" }))         {             @html.antiforgerytoken()             @html.validationsummary(false, "", new { @class = "text-danger" })              ......              @html.textboxfor(m => m.name)             <br/>             @html.validationmessagefor(m => m.name)              ......               }         .......      </div> </div>       

and jquery part:

function validatekeys(result) {     if (result.ok) {         $('#createcodemodaldiv').modal('hide');     } else {          alert("model invalid !");         $('#createcodemodaldiv').modal('show');     } } 

and until here working, after here don't know trigger validation message for.

any please? thanks