Add a treeView1 control to WinForm of C #.

Use the tag attribute placement encoding of TreeNode and the Text attribute placement name of TreeNode. The simplest example is as follows: add two nodes first and then process the AfterSelect event:
Using System;
Using System. Drawing;
Using System. Collections;
Using System. ComponentModel;
Using System. Windows. Forms;
Using System. Data;

Namespace testtree
{
/// <Summary>
/// Summary of Form1.
/// </Summary>
Public class Form1: System. Windows. Forms. Form
{
Private System. Windows. Forms. TreeView treeView1;
/// <Summary>
/// Required designer variables.
/// </Summary>
Private System. ComponentModel. Container components = null;

Public Form1 ()
{
//
// Required for Windows Form Designer support
//
InitializeComponent ();

//
// TODO: add Any constructor code after InitializeComponent calls
//
TreeNode tn = new TreeNode ();
Tn. Tag = "1001 ";
Tn. Text = "hello ";

TreeNode tn2 = new TreeNode ();
Tn2.Tag = "1002 ";
Tn2.Text = "OK ";

Tn. Nodes. Add (tn2 );

TreeView1.Nodes. Add (tn );
}

/// <Summary>
/// Clear all resources in use.
/// </Summary>
Protected override void Dispose (bool disposing)
{
If (disposing)
{
If (components! = Null)
{
Components. Dispose ();
}
}
Base. Dispose (disposing );
}

# Region code generated by Windows Form Designer
/// <Summary>
/// The designer supports the required methods-do not use the code editor to modify
/// Content of this method.
/// </Summary>
Private void InitializeComponent ()
{
This. treeView1 = new System. Windows. Forms. TreeView ();
This. SuspendLayout ();
//
// TreeView1
//
This. treeView1.ImageIndex =-1;
This. treeView1.Location = new System. Drawing. Point (16, 8 );
This. treeView1.Name = "treeView1 ";
This. treeView1.SelectedImageIndex =-1;
This. treeView1.TabIndex = 0;
This. treeView1.AfterSelect + = new System. Windows. Forms. TreeViewEventHandler (this. treeview=afterselect );
//
// Form1
//
This. AutoScaleBaseSize = new System. Drawing. Size (6, 14 );
This. ClientSize = new System. Drawing. Size (292,266 );
This. Controls. Add (this. treeView1 );
This. Name = "Form1 ";
This. Text = "Form1 ";
This. ResumeLayout (false );

}
# Endregion

/// <Summary>
/// Main entry point of the application.
/// </Summary>
[STAThread]
Static void Main ()
{
Application. Run (new Form1 ());
}

Private void treeviewappsafterselect (object sender, System. Windows. Forms. TreeViewEventArgs e)
{
String s = treeView1.SelectedNode. Tag. ToString ();
String s2 = treeView1.SelectedNode. Text. ToString ();
}
}
}