---
title: "Node Insertion in TreeView control in C#"  
description: "TreeView Control used for display hierarchical structured data e.g. XML. Here we can add new node in TreeView and also insert sub node in selected nod"  
author: "AVADHESH PATEL"  
published: 2012-07-21  
updated: 2019-11-01  
canonical: https://www.mindstick.com/articles/966/node-insertion-in-treeview-control-in-c-sharp  
category: "c#"  
tags: ["c#"]  
reading_time: 1 minute  

---

# Node Insertion in TreeView control in C#

TreeView Control used for display hierarchical structured data e.g. XML. Here we can add new node in TreeView and also insert sub node in selected node.\

##### Steps are given below:

Step1:-Take one windows Form and Design Form like below

![Node Insertion in TreeView control in C#](https://www.mindstick.com/mindstickarticle/4d20f28e-c5ae-4245-affc-59a68c23c198/images/f9404595-c5a7-4bd3-99d4-c5cc59cb2fe6.png)

Step 2:-write code on Form’s CS File

```
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms; namespace TreeView{    public partial class TreeView : Form    {        public TreeView()        {            InitializeComponent();                    }         private void btnInsert_Click(object sender, EventArgs e)        {            if (txtNode.Text.Trim().Length == 0 && txtSubNode.Text.Trim().Length == 0)            {                MessageBox.Show("Please Enter Node Value.", "Data Entry Error", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);            }             else if (txtNode.Text.Trim().Length != 0 && txtSubNode.Text.Trim().Length==0)            {                TreeNode parentNode = new TreeNode(txtNode.Text.Trim());//create an object of //Tree Node class and pass node name to the constructor of Tree Node.                treeView1.Nodes.Add(parentNode);//Adding parent node to a tree view.                txtNode.Clear();//Clear the text box control.            }             else if (treeView1.SelectedNode != null && txtSubNode.Text.Trim().Length != 0)            {                TreeNode childNode = new TreeNode(txtSubNode.Text);//Create an object of the child node and pass child node name to the constructor of Tree Node                treeView1.SelectedNode.Nodes.Add(childNode);//Add child node to the selected parent node                treeView1.ExpandAll();//Expand all the tree view control                txtSubNode.Clear();//clear the text box control.            }             else if (txtNode.Text.Trim().Length == 0 && txtSubNode.Text.Trim().Length != 0)            {                //show the message to select node to which child node should be added.                MessageBox.Show("Please Select Parent Node.", "Warning Message", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }             else            {                //show the message to select node to which child node should be added.                MessageBox.Show("Please Select Parent Node.", "Warning Message", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }        }         private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)        {            //select parent node            txtNode.Text = treeView1.SelectedNode.Text;        }    }}
```

##### Output:-\

![Node Insertion in TreeView control in C#](https://www.mindstick.com/mindstickarticle/4d20f28e-c5ae-4245-affc-59a68c23c198/images/a3ac91d8-1557-4a8b-bba0-8b2fc7a70146.png)

---

Original Source: https://www.mindstick.com/articles/966/node-insertion-in-treeview-control-in-c-sharp

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