protected void PopulatePortal2DDL(string selected_value)
        {
            PortalController portal_obj = new PortalController();
            DataTable dt = portal_obj.GetList();

            ddlPortalList.Items.Clear();
            ddlPortalList.DataSource = dt;
            ddlPortalList.DataTextField = "PortalName";
            ddlPortalList.DataValueField = "PortalId";
            ddlPortalList.DataBind();
            ddlPortalList.SelectedValue = selected_value;
            ddlPortalList.Enabled = false;
        }
    private void PopulatePortalList2DDL()
    {
        PortalController portal_obj = new PortalController();
        DataTable dtNodes = portal_obj.GetList();

        ddlPortalList.Items.Clear();
        ddlPortalList.DataSource = dtNodes;
        ddlPortalList.DataTextField = "PortalName";
        ddlPortalList.DataValueField = "PortalId";
        ddlPortalList.DataBind();
        //ddlPortalList.Items.Insert(0, new ListItem("- Chọn -", "0"));
        ddlPortalList.SelectedIndex = 0;
        ddlPortalList.AutoPostBack = true;
    }
        private void LoadPortalionList2DDL()
        {
            ddlPortalList.Items.Clear();

            PortalController portal_obj = new PortalController();
            DataTable dt = portal_obj.GetList(); //select all the nodes from DB
            ddlPortalList.DataSource = dt;
            ddlPortalList.DataTextField = "PortalName";
            ddlPortalList.DataValueField = "PortalId";
            ddlPortalList.DataBind();
            //ddlPortalList.Items.Insert(0, new ListItem("- Chọn -", "0"));
            ddlPortalList.SelectedValue = Session["PortalId"].ToString();
            ddlPortalList.Enabled = false;
        }
        private void PopulatePortalList2DDL()
        {
            PortalController portal_obj = new PortalController();
            DataTable dtNodes = portal_obj.GetList();

            ddlPortalList.Items.Clear();
            ddlPortalList.DataSource = dtNodes;
            ddlPortalList.DataTextField = "PortalName";
            ddlPortalList.DataValueField = "PortalId";
            ddlPortalList.DataBind();
            ddlPortalList.AutoPostBack = true;
            //ddlPortalList.Items.Insert(0, new ListItem("- Chọn -", "0"));           
            if (Session["PortalId"] == null && Session["PortalId"].ToString() == string.Empty)
            {
                ddlPortalList.SelectedIndex = 0;
                ddlPortalList.Enabled = true;
            }
            else
            {
                ddlPortalList.SelectedValue = Session["PortalId"].ToString();
                ddlPortalList.Enabled = false;
            }
            ddlPortalList.AutoPostBack = true;
        }
        private void PopulatePortalList2DDL()
        {
            PortalController portal_obj = new PortalController();
            DataTable dtNodes = portal_obj.GetList();

            ddlPortalList.Items.Clear();
            ddlPortalList.DataSource = dtNodes;
            ddlPortalList.DataTextField = "PortalName";
            ddlPortalList.DataValueField = "PortalId";
            ddlPortalList.DataBind();
            //ddlPortalList.Items.Insert(0, new ListItem("- Chọn -", "0"));

            string PortalId = Session["PortalId"].ToString();
            if(!string.IsNullOrEmpty(PortalId))
            {
                if (PortalId == "0")
                {
                    ddlPortalList.SelectedIndex = 0;
                    ddlPortalList.Enabled = true;
                }
                else
                {
                    ddlPortalList.SelectedValue = PortalId;
                    ddlPortalList.Enabled = false;
                }

            }
        }
        private void PopulatePortalList2DDL(string selected_value)
        {
            PortalController portal_obj = new PortalController();
            DataTable dtNodes = portal_obj.GetList();

            ddlPortalList.Items.Clear();
            ddlPortalList.DataSource = dtNodes;
            ddlPortalList.DataTextField = "PortalName";
            ddlPortalList.DataValueField = "PortalId";
            ddlPortalList.DataBind();
            ddlPortalList.AutoPostBack = true;
            //ddlPortalList.Items.Insert(0, new ListItem("- Chọn -", "0"));           
            if (string.IsNullOrEmpty(selected_value))
            {
                ddlPortalList.SelectedIndex = 0;
                ddlPortalList.Enabled = true;
            }
            else
            {
                ddlPortalList.SelectedValue = selected_value;
                ddlPortalList.Enabled = false;
            }
        }
        private void PopulatePortalList2DDL(string selected_value)
        {
            PortalController portal_obj = new PortalController();
            DataTable dtNodes = portal_obj.GetList();

            ddlPortalList.Items.Clear();
            ddlPortalList.DataSource = dtNodes;
            ddlPortalList.DataTextField = "PortalName";
            ddlPortalList.DataValueField = "PortalId";
            ddlPortalList.DataBind();
            //ddlPortalList.Items.Insert(0, new ListItem("- Chọn -", "0"));
            ddlPortalList.SelectedValue = selected_value;
            ddlPortalList.Enabled = false;
        }