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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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Default..aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
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