Using Entity Frame Work [Resolved]

hi to every one,
BuybooksDataBaseEntities db = new BuybooksDataBaseEntities();
DataTable table = new DataTable();
table = db.DisplayImages; // its showing that cannot implicitly convert object set to datatable
so i tried this
object obj=db.displayimages;

in my Dal:
        public object LoadImages()
        {  BuybooksDataBaseEntities db = new BuybooksDataBaseEntities();
                       var tabletest = db.DisplayImages;
           
            return tabletest;

        }

in my BAL
 public object LoadImages()
        {
            BuyBooksDAL.BuyBooksDal dal = new BuyBooksDAL.BuyBooksDal();
            return dal.LoadImages();
        }

in Aspx.cs
protected void Page_Load(object sender, EventArgs e)
        {
            GetImage();
        }
        private void GetImage()
        {
            BuyBooksBAL.BuyBooksBal bal = new BuyBooksBAL.BuyBooksBal();
            object obj = bal.LoadImages();
            lv1.DataSource = obj;
< Here before binding i want filter the table; i had a column category so i want to filter like this category="Stephen Hawking " >
            lv1.DataBind();
        }

Please Help Me .......

Thanks and Regards
V.SaratChand
Show difficulties that how difficult you are [Resolved]