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 protected void Page_Load(object sender, EventArgs e)
        {
           
            if (!Page.IsPostBack)
            {
                TreeNode nodeCategory ;
                connection conn = new connection();
                List<Category> category = conn.getCategory();
                Stack<Category> storeCategory = new Stack<Category>();
                storeCategory.Push(category[0]);
                nodeCategory = new TreeNode(category[0].Name.Trim(), category[0].Id.Trim());
                TreeView1.Nodes.Add(nodeCategory);
                getTreeView(storeCategory, category, nodeCategory);
                           &


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