Can you tell how to make a update in DB, with fileupload (File is updated ok)? - asp.net-mvc-4

Question

Can you tell how to make a update in DB, using fileupload (File is updated ok) ?
I dont get any errors message, but the edit controller make a new row in DB, instead of updating the old row.
I have tried to remove insertOnsubmit, but only result is no update at all, in DB
I'am using LINQ to SQL MVC4
Table id - CompanyNameCon - PdfCon
Controller:
public ActionResult Edit(int id = 0)
{
DAT_SupplyCon SupplyCon = db.DAT_SupplyCons.Where(x => x.ID == id).FirstOrDefault();
if (SupplyCon == null)
{
return HttpNotFound();
}
return View(SupplyCon);
}
//
// POST: /Books/Edit/5
[HttpPost]
public ActionResult Edit(DAT_SupplyCon DAT_SupplyCon, HttpPostedFileBase file)
{
if (ModelState.IsValid)
{
// Delete old file
FileUpload.DeleteFile(DAT_SupplyCon.PdfCon);
// Upload our file
DAT_SupplyCon.PdfCon = FileUpload.UploadFile(file);
???? db.DAT_SupplyCons.InsertOnSubmit(DAT_SupplyCon);
db.SubmitChanges();
return RedirectToAction("Index");
}
return View(DAT_SupplyCon);
}
view
#model CFire2.Models.DAT_SupplyCon
#{
ViewBag.Title = "Edit";
}
<h2>Edit</h2>
<script src="~/Scripts/jquery-1.8.2.min.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
#using (Html.BeginForm("Edit", "SupplyCon", FormMethod.Post, new { enctype = "multipart/form- data" }))
{
#Html.ValidationSummary(true)
<fieldset>
<legend>DAT_SupplyCon</legend>
<div class="editor-label">
#Html.LabelFor(model => model.SupplierCon)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.SupplierCon)
#Html.ValidationMessageFor(model => model.SupplierCon)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.CompanyNameCon)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.CompanyNameCon)
#Html.ValidationMessageFor(model => model.CompanyNameCon)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.PdfCon)
</div>
<div class="editor-field">
<input type="file" name="file" />
#Html.HiddenFor(model => model.PdfCon)
#Html.ValidationMessageFor(model => model.PdfCon)
</div>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
Utils:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
namespace CFire2.Utils
{
public static class FileUpload
{
public static char DirSeparator =
System.IO.Path.DirectorySeparatorChar;
public static string FilesPath = "Content" +
DirSeparator + "Uploads" + DirSeparator;
public static string UploadFile(HttpPostedFileBase file)
{
if (null == file) return "";
if (!(file.ContentLength > 0)) return "";
string fileName = file.FileName;
string fileExt = Path.GetExtension(file.FileName);
if (null == fileExt) return "";
if (!Directory.Exists(FilesPath))
{
Directory.CreateDirectory(FilesPath);
}
var path = Path.Combine(HttpContext.Current.Server.MapPath("~/Content/SupplyCon"),fileName);
file.SaveAs(Path);
return fileName;
}
public static void DeleteFile(string fileName)
{
if (fileName.Length == 0) return;
var path = Path.Combine(HttpContext.Current.Server.MapPath("~/Content/SupplyCon"), fileName);
if (File.Exists(Path.GetFullPath(path)))
{
File.Delete(Path.GetFullPath(path));
}
}
}
}

Answer 1

Add a hidden field for your primary key property to your form.
#Html.HiddenFor(model => model.ID)
Otherwise it'll be treated as a new record since no primary key is posted.

Answer 2

InsertOnSubmit method work on the basis of primary key .
if primary key value is not exists in DB it will create a new record otherwise it will update that record .
In your case you can use hidden field to store the primary key id into the model .
#Html.HiddenFor(model => model.PrimaryKeyID)