void LoadChild(TreeNode node)
    {
        List <Organization> orgs = Organizations.GetAllChildOrganizations(int.Parse(node.Value));

        if (orgs != null && orgs.Count > 0)
        {
            TreeNode tn = null;
            foreach (Organization o in orgs)
            {
                if (o.ParentID == int.Parse(node.Value))
                {
                    tn         = new TreeNode(o.OrganizationName, o.OrganizationID.ToString(), GlobalSettings.RelativeWebRoot + "images/default/department.gif");
                    tn.ToolTip = o.OrganizationDesc;
                    LoadChild(tn);
                    node.ChildNodes.Add(tn);
                }
            }
        }
    }