Building a dynamic Tree

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace DynamicTree
{
    public partial class Form1 : Form
    {
        DataTable tbl;
        DataColumn col;
       
        public Form1()
        {
            InitializeComponent();
            InitTable();
            initTableData();
        }

        private void InitTable()
        {
            tbl = new DataTable();

            col = new DataColumn("ID");
            tbl.Columns.Add(col);
            col = new DataColumn("PID");
            tbl.Columns.Add(col);
            col = new DataColumn("Info");
            tbl.Columns.Add(col);

            tbl.AcceptChanges();

            
        }

        private void initTableData()
        {
            DataRow r;

            r = tbl.NewRow();
            r["ID"] = "0";
            r["PID"] = "-1";
            r["Info"] = "Root";
            tbl.Rows.Add(r);

    
            r = tbl.NewRow();
            r["ID"] = "1";
            r["PID"] = "0";
            r["Info"] = "Menu1";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "10";
            r["PID"] = "0";
            r["Info"] = "Menu10";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "2";
            r["PID"] = "0";
            r["Info"] = "Menu2";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "3";
            r["PID"] = "0";
            r["Info"] = "Menu3";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "4";
            r["PID"] = "1";
            r["Info"] = "Menu4";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "5";
            r["PID"] = "4";
            r["Info"] = "Menu5";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "6";
            r["PID"] = "5";
            r["Info"] = "Menu6";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "7";
            r["PID"] = "2";
            r["Info"] = "Menu7";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "11";
            r["PID"] = "6";
            r["Info"] = "Menu11";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "8";
            r["PID"] = "10";
            r["Info"] = "Menu8";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "9";
            r["PID"] = "3";
            r["Info"] = "Menu9";
            tbl.Rows.Add(r);

            r = tbl.NewRow();
            r["ID"] = "12";
            r["PID"] = "7";
            r["Info"] = "Menu12";
            tbl.Rows.Add(r);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode r = new TreeNode();
            r.Text = "Root";
            initTreeView(r);
            tree.Nodes.Add(r);
            tree.ExpandAll();   
        }

        private void initTreeView(TreeNode N)
        {
            DataTable temp = new DataTable();
            col = new DataColumn("ID");
            temp.Columns.Add(col);
            col = new DataColumn("PID");
            temp.Columns.Add(col);
            col = new DataColumn("Info");
            temp.Columns.Add(col);
            temp.AcceptChanges();  
            
           
            string id = getID(N);            
            foreach (DataRow r1 in tbl.Rows)
            {
                if (r1["PID"].ToString() == id)
                {
                    DataRow r2 = temp.NewRow();
                    r2["ID"] = r1["ID"].ToString();
                    r2["PID"] = r1["PID"].ToString();
                    r2["Info"] = r1["Info"].ToString();
                    temp.Rows.Add(r2);
                    temp.AcceptChanges();
                }
            }

            foreach(DataRow r3 in temp.Rows)
            {
                TreeNode tn = new TreeNode();
                tn.Text = r3["Info"].ToString();
                initTreeView(tn);
                N.Nodes.Add(tn);
            }
        }

        private string getID(TreeNode N)
        {
            foreach (DataRow r in tbl.Rows)
            {
                if (r["Info"].ToString() == N.Text)
                    return r["ID"].ToString();
            }
            return "";
        }
    }
}