@model HelloWorldMvcApp.SampleViewModel
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Bootstrap 101 Template</title>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<link rel="stylesheet" href="https://fortawesome.github.io/Font-Awesome/assets/font-awesome/css/font-awesome.css">
.field-validation-error {
background: rgba(115,84,178,1);
background: -moz-linear-gradient(45deg, rgba(115,84,178,1) 0%, rgba(115,84,178,0.95) 34%, rgba(115,84,178,0.95) 35%, rgba(96,107,192,0.91) 62%, rgba(84,160,231,0.85) 100%);
background: -webkit-gradient(left bottom, right top, color-stop(0%, rgba(115,84,178,1)), color-stop(34%, rgba(115,84,178,0.95)), color-stop(35%, rgba(115,84,178,0.95)), color-stop(62%, rgba(96,107,192,0.91)), color-stop(100%, rgba(84,160,231,0.85)));
background: -webkit-linear-gradient(45deg, rgba(115,84,178,1) 0%, rgba(115,84,178,0.95) 34%, rgba(115,84,178,0.95) 35%, rgba(96,107,192,0.91) 62%, rgba(84,160,231,0.85) 100%);
background: -o-linear-gradient(45deg, rgba(115,84,178,1) 0%, rgba(115,84,178,0.95) 34%, rgba(115,84,178,0.95) 35%, rgba(96,107,192,0.91) 62%, rgba(84,160,231,0.85) 100%);
background: -ms-linear-gradient(45deg, rgba(115,84,178,1) 0%, rgba(115,84,178,0.95) 34%, rgba(115,84,178,0.95) 35%, rgba(96,107,192,0.91) 62%, rgba(84,160,231,0.85) 100%);
background: linear-gradient(45deg, rgba(115,84,178,1) 0%, rgba(115,84,178,0.95) 34%, rgba(115,84,178,0.95) 35%, rgba(96,107,192,0.91) 62%, rgba(84,160,231,0.85) 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#7354b2', endColorstr='#54a0e7', GradientType=1 );
<div class="col-md-6 col-md-offset-3">
<button runat="server" id="btnDownload" class="button" onserverclick="clickEvent">
<i class="fa fa-download" style="font-size:20px;float:left;"></i> DOWNLOAD
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
<script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>
<script type="text/javascript">
function openAlert(txt) {
$('.alert-content').text(txt);
$('.alert').addClass('in');
$('.alert').removeClass('in');
var answer = '@Model.Answer';
if(answer && answer != '')
$('#Question').change(closeAlert);
$('#Question').keyup(closeAlert);
$('.submit').click(function(){
url: '@Url.RouteUrl(new{ action="GetAnswer", controller="Home"})',
data: {Answer: '', Question: $('#Question').val()},
contentType: "application/json; charset=utf-8",
success: function(resp) {