Load list items in child list dynamically in ASP.NET MVC ListView control

@using Syncfusion.EJ2
@using Syncfusion.EJ2.Lists

@Html.EJS().ListView("listview").DataSource((IEnumerable<object>)ViewBag.dataSource).Fields(new ListViewFieldSettings { IconCss = "icon", Tooltip = "text" }).Select("onSelect").ShowIcon(true).ShowHeader(true).HeaderTitle("Folders").Render()


<style>
    #listview {
        display: block;
        max-width: 350px;
        margin: auto;
        border: 1px solid #dddddd;
        border-radius: 3px;
    }

    #listview.e-listview .e-list-icon {
        height: 24px;
        width: 30px;
    }

    .folder, .file {
        background: url('https://ej2.syncfusion.com/demos/src/listview/images/file_icons.png') no-repeat;
        background-size: 302%;
    }

    .folder {
        background-position: -5px -466px;
    }

    .file {
        background-position: -5px -151px;
    }
    /* csslint ignore:start */

    .new-list {
        color: deeppink !important;
    }

    /* csslint ignore:end */
</style>

<script>
    //Select event to add new list item in child page
    function onSelect(args) {
        //Add new file to the child page of selected list item
        this.dataSource[args.index].child.push({ id: '01-02', text: 'Newly Added File', icon: 'file', htmlAttributes: { role: 'li', class: 'new-list' } });
    }
</script>

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

namespace WebApplication1.Controllers
{
    public class ListViewController : Controller
    {
        public IActionResult list()
        {   
            List<object> listdata = new List<object>();
            listdata.Add(new
            {
                id = "01",
                text = "Music",
                icon = "folder",
                child = new List<object>() { new { id = "01-01", text = "Gouttes.mp3", icon = "file" } }
            });
            listdata.Add(new
            {
                id = "02",
                text = "Videos",
                icon = "folder",
                child = new List<object>() {
                   new { id= "02-01", text= "Naturals.mp4", icon= "file" },
                   new { id= "02-02", text= "Wild.mpeg", icon= "file" },
                }
            });
            listdata.Add(new
            {
                id = "03",
                text = "Documents",
                icon = "folder",
                child = new List<object>() {
                   new { id= "03-01", text= "Environment Pollution.docx", icon= "file" },
                   new { id= "03-02", text= "Global Water, Sanitation, & Hygiene.docx", icon= "file" },
                   new { id= "03-03", text= "Global Warming.ppt", icon= "file" },
                   new { id= "03-04", text= "Social Network.pdf", icon= "file" },
                   new { id= "03-05", text= "Youth Empowerment.pdf", icon= "file" }
               }
            });

            listdata.Add(new
            {
                id = "04",
                text = "Pictures",
                icon = "folder",
                child = new List<object>() {
                   new {
                        id= "04-01", text= "Camera Roll", icon= "folder",
                        child= new List<object>() {
                          new  { id= "04-01-01", text= "WIN_20160726_094117.JPG", icon= "file" },
                           new { id= "04-01-02", text= "WIN_20160726_094118.JPG", icon= "file" },
                           new { id= "04-01-03", text= "WIN_20160726_094119.JPG", icon= "file" }
                        }
                    },
                 new   {
                        id= "04-02", text= "Wind.jpg", icon= "file"
                    },
                  new  {
                        id= "04-02", text= "Stone.jpg", icon= "file"
                    },
                 new   {
                        id= "04-02", text= "Home.jpg", icon= "file"
                    },
                  new  {
                        id= "04-02", text= "Bridge.png", icon= "file"
                    }
             }
            });
            listdata.Add(new
            {

                id = "05",
                text = "Downloads",
                icon = "folder",
                child = new List<object>() {
                   new { id= "05-01", text= "UI-Guide.pdf", icon= "file" },
                   new  { id= "05-02", text= "Tutorials.zip", icon= "file" },
                   new  { id= "05-03", text= "Game.exe", icon= "file" },
                   new { id= "05-04", text= "TypeScript.7z", icon= "file" },
               }
            });
            ViewBag.dataSource = listdata;
            return View();
        }       
    }
}