protected void Page_Load(object sender, EventArgs e) { if (Session["IsValid"] == null) { Response.Redirect("../Login.aspx"); } if (this.IsPostBack == false) { DALProduct obj = new DALProduct(); DataSet ds = obj.ProductList_Load(); ddlCategory.DataTextField = "CategoryName"; ddlCategory.DataValueField = "CategoryCode"; ddlCategory.DataSource = ds.Tables[0]; ddlCategory.DataBind(); BindProducts(); } }