asp.net mvc - By clicking submit button when form fields are not validated ReturnUrl from browser vanished -


by clicking submit button when form fields not validated returnurl browser vanished.

before clicking submit button browser seems like.

enter image description here

after clicking submit button(while form fields not validated till) browser seems like.

enter image description here

how maintain same browsing address after clicking submit button after login should redirect page.?

here action code

[httppost] [allowanonymous] [validateantiforgerytoken] public actionresult login(loginmodel model, string returnurl) {     if (modelstate.isvalid)     {         if (membership.validateuser(model.username, model.password))         {             formsauthenticationticket authticket = new formsauthenticationticket(1,             model.username,             datetime.now,             datetime.now.addminutes(30), // value of time out property             false, // value of ispersistent property             string.empty,             formsauthentication.formscookiepath);             string encticket = formsauthentication.encrypt(authticket);             httpcookie facookie = new httpcookie(formsauthentication.formscookiename, encticket);             response.cookies.add(facookie);             formsauthentication.setauthcookie(model.username, model.rememberme);             return redirecttolocal(returnurl ?? url.action("index", "home"));         }         else         {             // if got far, failed, redisplay form             modelstate.addmodelerror("", "the user name or password provided incorrect.");             return view();         }     }     else     {         return view(model);     } }

thanks in advance

assuming view has 

@using (html.beginform(new { returnurl = viewbag.returnurl })) { ...

then when validation fails, need re-assign value in action method

if (modelstate.isvalid) {   .... } else {   // if got far, failed, redisplay form   modelstate.addmodelerror("", "the user name or password provided incorrect.");   viewbag.returnurl = returnurl; // add line   return view(); }

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