Why ModelState is getting false as validation? - asp.net

Question

My ModelState is getting false everytime i run the code .This is simply a file upload mvc .net core code. Migration is also perfectly executed. However whenever i try to submit the form after uploading an image the form gets reset. Due to which it failed to get store in the database.
Model code (Image.cs)
using Microsoft.AspNetCore.Http;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Threading.Tasks;
namespace FileUpload.Models
{
public class Image
{
[Key]
public int Iid { get; set; }
[Required]
public string Iname { get; set; }
[Required]
[NotMapped]
public IFormFile Iimg { get; set; }
}
}
Controller Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.EntityFrameworkCore;
using FileUpload.Data;
using FileUpload.Models;
using Microsoft.AspNetCore.Hosting;
using System.IO;
namespace FileUpload.Controllers
{
public class ImagesController : Controller
{
private readonly AppDbContext _context;
private readonly IWebHostEnvironment _hostEnvironment;
public ImagesController(AppDbContext context, IWebHostEnvironment hostEnvironment)
{
_context = context;
_hostEnvironment = hostEnvironment;
}
// GET: Images
public async Task<IActionResult> Index()
{
return View(await _context.Images.ToListAsync());
}
// GET: Images/Details/5
public async Task<IActionResult> Details(int? id)
{
if (id == null)
{
return NotFound();
}
var image = await _context.Images
.FirstOrDefaultAsync(m => m.Iid == id);
if (image == null)
{
return NotFound();
}
return View(image);
}
// GET: Images/Create
public IActionResult Create()
{
return View();
}
// POST: Images/Create
// To protect from overposting attacks, enable the specific properties you want to bind to.
// For more details, see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(Image image)
{
if (ModelState.IsValid)
{
if(image.Iimg != null)
{
string wwwRootPath = _hostEnvironment.WebRootPath;
string fileName = Path.GetFileNameWithoutExtension(image.Iimg.FileName);
string ext = Path.GetExtension(image.Iimg.FileName);
image.Iname = fileName + DateTime.Now.ToString("yymmssfff") + ext;
string path = Path.Combine(wwwRootPath + "/Image/" + fileName);
using (var fileStream = new FileStream(path, FileMode.Create))
{
await image.Iimg.CopyToAsync(fileStream);
}
}
_context.Add(image);
await _context.SaveChangesAsync();
return RedirectToAction("Index");
}
return View(image);
}
}