ASP.NET

Need Help about PDF document opened in iframe using ASP.Net MVC

My requirement is to provide a facility in my application to open a PDF document in editable format, user will edit and sign the PDF fields and submit it back. I load the document in iFrame and now i want to get all the fields in the PDF form on submit click. Can u please help me

My VIEW code is as below

<form id="frmPDF" enctype="multipart/form-data" method="post" action="@Url.Action("SavePDF", "Home")" target="_blank">
<iframe type='application/pdf' name='PDFObj' id='PDFObj' src="@Url.Action("GetPDF", "Home")" style="width: 100%; height: 625px;" ></iframe>
<input type="submit" value="Submit PDF" />
<input type="hidden" name="hid" value="safd" /> 
</form>

<script>
$(document).ready(function() {
    $('form').on("submit", function (event) {
        var form = $(this);
        var iframe = document.getElementById('PDFObj');
        var iframeDocument = [iframe.contentDocument || iframe.contentWindow.document];

        var pluginData = iframeDocument;            
        $(form).append('<input type="file" name="PDFInput" id="PDFInput" value="' + pluginData + '" style="visibility:hidden"/>');
        form.submit();
    });
});
</script>

public ActionResult GetPDF()
{
    return File("~/Content/newDocument.pdf", "application/pdf");
}

[HttpPost]
public ActionResult SavePDF()
{
    var hid = Request["hid"];
    HttpPostedFileBase file = Request.Files[0];
    if (file != null && file.ContentLength > 0)
    {
        var fileName = Path.GetFileName(file.FileName);
        var path = Path.Combine(Server.MapPath("~/App_Data"), fileName);
        file.SaveAs(path);
    }
    return View("Index");
}

The model backing the 'MVCDBContext' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269).

namespace MVCWithWebApiApp.Controllers
{
    public class UserController : Controller
    {
        public ActionResult Index()
        {
            var dbContext = new MVCDBContext();

            List<User> listOfEmployees;
            //var a = oDAL.employees;
            listOfEmployees = dbContext.Users.ToList();
            return Json(listOfEmployees, JsonRequestBehavior.AllowGet);

            //return View();
        }

        //
        // GET: /User/Details/5

        public ActionResult Details(int id)
        {
            return View();
        }

        //
        // GET: /User/Create

        public ActionResult Create()
        {
            return View();
        }

        //
        // POST: /User/Create

        [HttpPost]
        public ActionResult Create(FormCollection collection)
        {
            try
            {
                // TODO: Add insert logic here

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }

        //
        // GET: /User/Edit/5

        public ActionResult Edit(int id)
        {
            return View();
        }

        //
        // POST: /User/Edit/5

        [HttpPost]
        public ActionResult Edit(int id, FormCollection collection)
        {
            try
            {
                // TODO: Add update logic here

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }

        //
        // GET: /User/Delete/5

        public ActionResult Delete(int id)
        {
            return View();
        }

        //
        // POST: /User/Delete/5

        [HttpPost]
        public ActionResult Delete(int id, FormCollection collection)
        {
            try
            {
                // TODO: Add delete logic here

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
    }
}

namespace MVCWithWebApiApp.Models
{
    public class MVCDBContext : DbContext
    {
        public DbSet<User> Users { get; set; }
    }
}

namespace MVCWithWebApiApp.Models
{
    public class User
    {
        private int _userId;
        public int UserId
        {
            get { return _userId; }
            set { _userId = value; }
        }

        private string _userName;
        public string UserName
        {
            get { return _userName; }
            set { _userName = value; }
        }

    }
}

<add name="MVCDBContext" providerName="System.Data.SqlClient" connectionString="Data Source=KNW-DEL-ABDUL\SQL2008R2;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False"/>