c# - View not showing ValidationSummary and ValidationMessages -

i have view:

@using (html.beginform()) {     @html.antiforgerytoken()     @html.validationsummary(true)     <div class="input-group">             <div class="input-group-addon">                 @html.label("employee number", new { @class = "control-label" })             </div>             <div class="a">                 @html.textboxfor(model => model.employeeno, new {@class="form-control" })                 @html.validationmessagefor(model => model.employeeno)             </div>         </div>        /*        * other fields        */ } 

and controller:

[httppost] public actionresult edit([bind(include="id,employeeno,name,surname,contactinfo,roleid")] user user) {     validaterequestheader(request);     if (modelstate.isvalid)     {         unitofwork.userrepository.update(user);         unitofwork.save();         return json(new { ok = true, newurl = url.action("index") });     }     //modelstate.addmodelerror("", "niepoprawne dane");     viewbag.roleid = new selectlist(unitofwork.rolerepository.get(), "id", "rolename", user.roleid);     return partialview(user); } 

and model:

public partial class user {     public user()     {         this.deviceusages = new hashset<deviceusage>();     }      public int id { get; set; }     [required(errormessage="brak numeru pracownika")]     public string employeeno { get; set; }     [required(errormessage = "brak imienia")]     public string name { get; set; }     [required(errormessage = "brak nazwiska")]     public string surname { get; set; }     [required(errormessage = "brak adresu email")]     public string contactinfo { get; set; }     public int roleid { get; set; } } 

data annotations working. if leave eg. name empty modelstate not valid in controler. validation messages not shown. if uncomment line: modelstate.addmodelerror("", "niepoprawne dane"); model error shown in view.

where mistake in code?

it's because using @html.validationsummary(true) means excludepropertyerrors = true