File download in CORE(2.1) & MVC6

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Threading.Tasks;

using Microsoft.AspNetCore.Hosting;

using Microsoft.AspNetCore.Mvc;

using Microsoft.AspNetCore.Mvc.Rendering;

using WebApplication1.Models;

namespace WebApplication1.Controllers

{

    public class JagannathController : Controller

    {

        private readonly IRepository<JBS> JRepository;

        private readonly IHostingEnvironment hostingEnvironment;

        public JagannathController(IRepository<JBS> jRepository, IHostingEnvironment HostingEnvironment)

        {

            this.JRepository = jRepository;

            this.hostingEnvironment = HostingEnvironment;

        }

       

        [HttpGet]

        public IActionResult down()

        {

            string Filename = "173f561f-a204-425a-a77d-7ca0acdd0c79_HPSM.png";

            string downloadFolder = string.Empty;

            downloadFolder = Path.Combine(hostingEnvironment.WebRootPath, @"images\");

            byte[] fileBytes = System.IO.File.ReadAllBytes(downloadFolder + Filename);

            return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, Filename);

        }

    }

}