Integrate avatar into ListView in ASP.NET Core Avatar control

@{ var template = "<div class='listWrapper'>" +
        "${if(avatar!=='')}" +
        "<span class='e-avatar e-avatar-small e-avatar-circle'>${avatar}</span>" +
        "${else}" +
        "<span class='${pic} e-avatar e-avatar-small e-avatar-circle'> </span>" +
        "${/if}" +
        "<span class='text'>" +
        "${text} </span> </div>";}
    <div class="col-lg-12 control-section">
        <ejs-listview id='letterAvatarList' dataSource=@ViewBag.dataSource headerTitle='Contacts' template="@template" showHeader=true sortOrder="Ascending">
        </ejs-listview>
    </div>


<style>
    .control-section {
        overflow: auto;
    }

    /* Listview Customization */

    #letterAvatarList {
        max-width: 350px;
        margin: auto;
        border: 1px solid #dddddd;
        border-radius: 3px;
    }

        #letterAvatarList .listWrapper {
            width: inherit;
            height: inherit;
            position: relative;
        }

        #letterAvatarList .e-list-header {
            height: 54px;
        }

    .material #letterAvatarList .e-list-header .e-text {
        line-height: 22px;
    }

    .fabric #letterAvatarList .e-list-header .e-text {
        line-height: 22px;
    }

    .bootstrap #letterAvatarList .e-list-header .e-text {
        line-height: 13px;
    }

    .highcontrast #letterAvatarList .e-list-header .e-text {
        line-height: 20px;
    }

    #letterAvatarList .e-list-item {
        cursor: pointer;
        height: 50px;
        line-height: 44px;
        border: 0;
    }

    /* Badge Positioning */

    #letterAvatarList .e-badge {
        margin-top: 12px;
    }

    #letterAvatarList .listWrapper .text {
        width: 60%;
        display: inline-block;
        vertical-align: middle;
        margin: 0 50px;
    }

    /* Avatar Positioning */

    #letterAvatarList .listWrapper .e-avatar {
        position: absolute;
        top: calc(100% - 40px);
        font-size: 10px;
        left: 5px;
    }

    /* Avatar Background Customization */

    #letterAvatarList .e-list-item:nth-child(1) .e-avatar {
        background-color: #039BE5;
    }

    #letterAvatarList .e-list-item:nth-child(3) .e-avatar {
        background-color: #E91E63;
    }

    #letterAvatarList .e-list-item:nth-child(5) .e-avatar {
        background-color: #009688;
    }

    /* Avatar images using 'background-image' property */

    .pic01 {
        background-image: url('./../css/avatar/images/pic01.png');
    }

    .pic02 {
        background-image: url('./../css/avatar/images/pic02.png');
    }

    .pic03 {
        background-image: url('./../css/avatar/images/pic03.png');
    }

    .pic04 {
        background-image: url('./../css/avatar/images/pic04.png');
    }
</style>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace EJ2MVCSampleBrowser.Controllers.Avatar
{
    public partial class AvatarController : Controller
    {
        public ActionResult Listview()
        {
            List<object> data = new List<object>();
            data.Add(new { text = "Robert", id = "s_01", avatar= "", pic= "pic04" });
            data.Add(new { text = "Nancy", id = "s_02", avatar= "N", pic= "" });
            data.Add(new { text = "John", id = "s_03", pic= "pic01", avatar= "" });
            data.Add(new { text = "Andrew", id = "s_04", avatar= "A", pic= "" });
            data.Add(new { text = "Michael", id = "s_05", pic= "pic02", avatar= "" });
            data.Add(new { text = "Steven", id = "s_06", pic= "pic03", avatar= "" });
            data.Add(new { text = "Margaret", id = "s_07", avatar= "M", pic= "" });
            ViewBag.dataSource = data;
            return View();
        }
    }

}