How to add Serial/Index # column at the start of Jquery Datatable

Question

Kindly checkout my complete view and add the required code I have tried many from Stack overflow but none of them work for me below is my code.

@{
ViewBag.Title = "Question List";
Layout = "~/Views/Login/Dashboard2.cshtml";
}
<hr />
<h2>Questions List</h2>
<hr />
<p>
@Html.ActionLink("Create New", "Create", null, new { @class = "btn btn-primary" })
</p>
<br /><br />
<table id="tblQuetions">
<thead>
<tr>
<th>
Question Description
</th>
<th>
Type
</th>
<th>
Status
</th>
<th>
Start Date
</th>
<th>
Created By
</th>
<th>Edit</th>
<th>Delete</th>
</tr>
</thead>
</table>
<link href="//cdn.datatables.net/1.10.15/css/jquery.dataTables.min.css" rel="stylesheet" />
@*<link rel="//cdn.datatables.net/1.10.20/css/jquery.dataTables.min.css" type="text/css" />*@
@section scripts
{
<script src="//cdn.datatables.net/1.10.15/js/jquery.dataTables.min.js"></script>
<script>
$(document).ready(function () {
$("#tblQuetions").DataTable({
rowReorder: true,
"ajax": {
"url": "/Questions/GetList",
"type": "POST",
"processing": true,
"serverSide": true,
"datetype": "json"
},
"columns": [
// { "data": "Semester_Id", "name": "Semester_Id", "autoWidth": true },
{ "data": "QuestionText" },
{ "data": "Evaluation_Type" },
{ "data": "Status" },
{
"data": "Date_Created", 'render': function (jsonDate) {
var date = new Date(parseInt(jsonDate.substr(6)));
var month = date.getMonth() + 1;
return month + "/" + date.getDate() + "/" + date.getFullYear();
} },
{ "data": "Added_By" },
{
"render": function (data, type, full, meta) { return '<a class="btn btn-info" href="/Questions/Edit/' + full.Id + '">Edit</a>'; }
},
{
"render": function (data, type, full, meta) { return '<a class="btn btn-danger" href="/Questions/Delete/' + full.Id + '">Delete</a>'; }
},
]
});
});
function DeleteData(Id) {
if (confirm("Are you sure you want to delete ...?")) {
Delete(Id);
}
else {
return false;
}
}
function Delete(Id) {
var url = '@Url.Content("~/")' + "Demo/DeleteCustomer";
$.post(url, { ID: Id }, function (data) {
if (data == "Deleted") {
alert("Delete Customer !");
oTable = $('#tblQuetions').DataTable();
oTable.draw();
}
else {
alert("Something Went Wrong!");
}
});
}
</script>
}
@Scripts.Render("~/bundles/jquery")
<script type="text/javascript" src="//tinymce.cachefly.net/4.0/tinymce.min.js"></script>
<script type="text/javascript">
tinymce.init({ selector: 'textarea', width: 500 });
</script>