Usercontrol/TreeView.ascx.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class UserControl_TreeView : System.Web.UI.UserControl
{

    BLL.TreeView treeValues = new BLL.TreeView();
    
    protected void Page_Load(object sender, EventArgs e)
    {
        DataTable dt = treeValues.GetTreeview();

        TreeView1.Nodes.Clear();
        foreach (DataRow dr in dt.Rows)
        {
            TreeNode node = new TreeNode(dr["Name"].ToString(), dr["Id"].ToString());
            TreeView1.Nodes.Add(node);

            AddChildNode(node, dr["Id"].ToString());

        }




    }
    private void AddChildNode(TreeNode parentNode, string parentId)
    {
        DataTable dt = treeValues.GetTreeChild(parentId);
        foreach (DataRow dr in dt.Rows)
        {
            TreeNode node = new TreeNode(dr["Name"].ToString(), dr["Id"].ToString());
            parentNode.ChildNodes.Add(node);

            AddChildNode(node, dr["Id"].ToString());

        }


    }


    protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
    {

        string Categories = TreeView1.SelectedNode.Text;
        Response.Redirect("~/UI/GoodCategories.aspx?Categories=" + Server.UrlEncode(Categories));
    }

    protected void TreeView1_DataBound(object sender, EventArgs e)