How to display alert message box in asp.net core mvc controller? -


i want display alert message box when account model invalid. how should gonna in controller in asp.net core mvc? here controller's code

    [httppost]     public iactionresult index(account model)     {         if (model.id != null && model.password != null)         {             using (var db = new accountdbcontext())             {                 var account = db.account.firstordefault(                                 => a.id.equals(model.id) && a.password.equals(model.password)                               );                  if(account != null)                     return redirecttoaction("index", "main");                     }             //i want display error msg box...here "check id or pw".             modelstate.addmodelerror("", "error");          }           return view();     }

i searched way there no "page" identifier or "response.write()" method in controller class.... how should gonna do?

p.s way checked model's validation right way? (i used model , check it's partial properties, instead using view model )

define error in controller:

modelstate.addmodelerror("error", "check id");

and display in view:

@if (!viewdata.modelstate.isvalid && viewdata.modelstate["error"].errors.count > 0) {     <div class="alert alert-        <strong>error!</strong> danger">@viewdata.modelstate["error"].errors.first().errormessage     </div> }

edit

to show alert box, add javascript in view, following uses jquery:

<head>     <script type="text/javascript">         @if (!viewdata.modelstate.isvalid && viewdata.modelstate["error"].errors.count > 0)         {             <text>             $(document).ready(function() {                 alert('@viewdata.modelstate["error"].errors.first().errormessage');             });             </text>         }     </script> </head>

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