[Table("Post")]
public partial class Post
{
    public int PostID { get; set; }

    [Required]
    [StringLength(256)]
    public string Title { get; set; }

    [StringLength(256)]
    public string Description { get; set; }

    [StringLength(256)]
    public string Picture { get; set; }

    public int CategoryID { get; set; }

    [StringLength(10)]
    public string ViewNumber { get; set; }

    public int UserID { get; set; }

    public DateTime CreateDate { get; set; }

    public int LikeNumber { get; set; }

    public int? CommentID { get; set; }
}

[HttpPost]
    public ActionResult UpPost(Post model, HttpPostedFileBase txtImg)
    {
            var db = new ShareImageDbContext();

                if (ModelState.IsValid)
            {
            if (txtImg != null)
            {
                txtImg.SaveAs(HttpContext.Server.MapPath("~/Images/")
                                                      + txtImg.FileName);
                var post = new Post();
                post.PostID = model.PostID;
                post.Title = model.Title;
                post.Description = model.Description;
                post.CategoryID = model.CategoryID;
                var userSession = new UserLogin();
                userSession = (UserLogin)Session[ShareImage.Common.CommonConstants.USER_SESSION];
                post.UserID = userSession.UserID;
                post.CreateDate = DateTime.Now;
                post.Picture = txtImg.FileName;
                db.Posts.Add(post);
                db.SaveChanges();

                    return RedirectToAction("Index", "Homeuser");
                }

                    else
            {
                ModelState.AddModelError("", "Đăng ảnh thất bại!");
            }
        }
        return View(txtImg);
        }

@model IEnumerable<Model.EF.Post>

@foreach (var item in Model)