Load content through Ajax

<div class="col-lg-12 control-section">
    <div class="e-sample-resize-container">
        <div id="ej2Tab"></div>
    </div>
</div>

<style>
    #container {
        visibility: hidden;
    }

    #loader {
        color: #008cff;
        height: 40px;
        left: 45%;
        position: absolute;
        top: 45%;
        width: 30%;
    }

    .e-content .e-item {
        font-size: 12px;
        margin: 10px;
        text-align: justify;
    }
</style>

<script>
    var ajax = new ej.base.Ajax('./network.html', 'GET', true);
    ajax.send().then();
    ajax.onSuccess = function (data) {
        var ctn2 = data;
        var tabObj = new ej.navigations.Tab({
            items: [
                {
                    header: { 'text': 'Facebook' },
                    content: 'Facebook is an online social networking service headquartered in Menlo Park, California. Its website was ' +
                    'launched on February 4, 2004, by Mark Zuckerberg with his Harvard College roommates and fellow students Eduardo ' +
                    'Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes.The founders had initially limited the website\'\s ' +
                    'membership to Harvard students, but later expanded it to colleges in the Boston area, the Ivy League, and Stanford ' +
                    'University. It gradually added support for students at various other universities and later to high-school students.'
                },
                {
                    header: { 'text': 'Whatsapp' },
                    content: 'WhatsApp Messenger is a proprietary cross-platform instant messaging client for smartphones that operates ' +
                    'under a subscription business model. It uses the Internet to send text messages, images, video, user location and ' +
                    'audio media messages to other users using standard cellular mobile numbers. As of February 2016, WhatsApp had a user ' +
                    'base of up to one billion,[10] making it the most globally popular messaging application. WhatsApp Inc., based in ' +
                    'Mountain View, California, was acquired by Facebook Inc. on February 19, 2014, for approximately US$19.3 billion.'
                },
                { header: { 'text': 'Twitter' }, content: ctn2 },
            ]
        });

        //Render initialized Tab component
        tabObj.appendTo('#ej2Tab');
    }
</script>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Syncfusion.EJ2.Navigations;

namespace WebApplication1.Controllers
{
    public partial class TabController : Controller
    {
        public IActionResult ajax()
        {
            return View();
        }
    }
}