protected void btn_MyCart_Click(object sender, EventArgs e) { if (Session["type"].ToString() == "Student") { int bid = Convert.ToInt32(txt_Bookid.Text); int sid = Convert.ToInt32(Session["loginid"]); LibraryDAL dal = new LibraryDAL(); int CartID = dal.AddCart(bid, sid); if (CartID == 0) { lbl_msg.Text = "Book is already in cart"; } else { lbl_msg.Text = "Book added in Cart :" + CartID; } } else { lbl_msg.Text = "Admin Cannot Add to Cart"; } }