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Home Interviews What is basic concept for tree view – MindStick
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1 Answers

Mark Devid
Mark Devid 16 Sep 2016
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TreeNode is the keyword which is used to represent the node for the Treeview. 

We need to define the name for the TreeNode 

eg ;- TreeNode Node1 

How to add 1st element in the node : 

syntax  tNode = treeView1.Nodes.Add("Country"); 

treeView1 is the name of the Tree view which is present in your form


Mark Devid


Now, we can add many node to this  node. 

eg. treeView1.Nodes[0].Nodes.Add("India"); 

        we can add many node to 2nd node       

eg treeView1.Nodes[0].Nodes[0].Nodes.Add("Delhi"); 

Here is the complete code we can implement in our coding

 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace WindowsFormsApplication18
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode node1,tNode;
 
            tNode = treeView1.Nodes.Add("Country");
 
            treeView1.Nodes[0].Nodes.Add("India");
            treeView1.Nodes[0].Nodes[0].Nodes.Add("Delhi");
 
            treeView1.Nodes[0].Nodes.Add("Australia");
            treeView1.Nodes[0].Nodes[1].Nodes.Add("Canberra");
            treeView1.Nodes[0].Nodes[1].Nodes.Add("Perth");
 
            treeView1.Nodes[0].Nodes.Add("NewZealand");
            treeView1.Nodes[0].Nodes[2].Nodes.Add("Auckland");
            treeView1.Nodes[0].Nodes[2].Nodes[0].Nodes.Add("North_land");
        }
        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(treeView1.SelectedNode.FullPath.ToString());
        }
    }
}

 Mark Devid

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