Csharp/C Sharp by API/System.Windows.Forms/TreeView

extends TreeView

 
/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System.IO;
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
namespace DirectoryTreeHost
{
    /// <summary>
    /// Summary description for DirectoryTreeHost.
    /// </summary>
    public class DirectoryTreeHost : System.Windows.Forms.Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public DirectoryTreeHost()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            // 
            // DirectoryTreeHost
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Name = "DirectoryTreeHost";
            this.Text = "DirectoryTreeHost";
            this.Load += new System.EventHandler(this.DirectoryTreeHost_Load);
        }
        #endregion
        private void DirectoryTreeHost_Load(object sender, System.EventArgs e)
        {
            DirectoryTree dirTree = new 
                DirectoryTree();
            dirTree.Size = new Size(this.Width - 30, this.Height - 60);
            dirTree.Location = new Point(5, 5);
            dirTree.Drive = Char.Parse("C");
            this.Controls.Add(dirTree);
        }
        public static void Main()
        {
            Application.Run(new DirectoryTreeHost());
        }
    }
    public class DirectoryTree : TreeView
    {
        public delegate void DirectorySelectedDelegate(object sender,
            DirectorySelectedEventArgs e);
        public event DirectorySelectedDelegate DirectorySelected;
        
        private Char drive;
        public Char Drive
        {
            get
            {
                return drive;
            }
            set
            {
                drive = value;
                RefreshDisplay();
            }
        }
        
        // This is public so a Refresh can be triggered manually.
        public void RefreshDisplay()
        {
            // Erase the existing tree.
            this.Nodes.Clear();
            
            // Set the first node.
            TreeNode rootNode = new TreeNode(drive + ":\\");
            this.Nodes.Add(rootNode);
            
            // Fill the first level and expand it.
            Fill(rootNode);
            this.Nodes[0].Expand();
        }
        
        private void Fill(TreeNode dirNode)
        {
            DirectoryInfo dir = new DirectoryInfo(dirNode.FullPath);
            
            // An exception could be thrown in this code if you don"t
            // have sufficient security permissions for a file or directory.
            // You can catch and then ignore this exception.
            
            foreach (DirectoryInfo dirItem in dir.GetDirectories())
            {
                // Add node for the directory.
                TreeNode newNode = new TreeNode(dirItem.Name);
                dirNode.Nodes.Add(newNode);
                newNode.Nodes.Add("*");
            }
        }
        
        protected override void OnBeforeExpand(TreeViewCancelEventArgs e)
        {
            base.OnBeforeExpand(e);
            // If a dummy node is found, remove it and read the real directory list.
            if (e.Node.Nodes[0].Text == "*")
            {
                e.Node.Nodes.Clear();
                Fill(e.Node);
            }
        }
        
        protected override void OnAfterSelect(TreeViewEventArgs e)
        {
            base.OnAfterSelect(e);
            
            // Raise the DirectorySelected event.
            if (DirectorySelected != null)
            {
                DirectorySelected(this,
                    new DirectorySelectedEventArgs(e.Node.FullPath));
            }
        }
    }
    public class DirectorySelectedEventArgs : EventArgs
    {
        public string DirectoryName;
        public DirectorySelectedEventArgs(string directoryName)
        {
            this.DirectoryName = directoryName;
        }
    }

}

TreeView.AfterSelect

 
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace TreeViewExample
{
    /// <summary>
    /// Summary description for TreeViewExample.
    /// </summary>
    public class TreeViewExample : System.Windows.Forms.Form
    {
        internal System.Windows.Forms.TreeView treeFood;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public TreeViewExample()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.treeFood = new System.Windows.Forms.TreeView();
            this.SuspendLayout();
            // 
            // treeFood
            // 
            this.treeFood.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
                | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right);
            this.treeFood.ImageIndex = -1;
            this.treeFood.Location = new System.Drawing.Point(4, 5);
            this.treeFood.Name = "treeFood";
            this.treeFood.SelectedImageIndex = -1;
            this.treeFood.Size = new System.Drawing.Size(284, 256);
            this.treeFood.TabIndex = 1;
            this.treeFood.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeFood_AfterSelect);
            // 
            // TreeViewExample
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.treeFood});
            this.Name = "TreeViewExample";
            this.Text = "TreeView Example";
            this.Load += new System.EventHandler(this.TreeViewExample_Load);
            this.ResumeLayout(false);
        }
        #endregion
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new TreeViewExample());
        }
        private void TreeViewExample_Load(object sender, System.EventArgs e)
        {
            TreeNode node;
            
            node = treeFood.Nodes.Add("Fruits");
            node.Nodes.Add("Apple");
            node.Nodes.Add("Peach");
            
            node = treeFood.Nodes.Add("Vegetables");
            node.Nodes.Add("Tomato");
            node.Nodes.Add("Eggplant");
        }
        private void treeFood_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
        {
            if (e.Action == TreeViewAction.ByMouse)
            {
                MessageBox.Show(e.Node.FullPath);
            }
        }
    }
}

TreeView.BeforeExpand

 
/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace TreeViewDataBinding
{
  /// <summary>
  /// Summary description for TreeViewDataBinding.
  /// </summary>
  public class TreeViewDataBinding : System.Windows.Forms.Form
  {
    internal System.Windows.Forms.Panel Panel2;
    internal System.Windows.Forms.Panel Panel3;
    internal System.Windows.Forms.Label lblInfo;
    internal System.Windows.Forms.Label Label1;
    internal System.Windows.Forms.Splitter Splitter1;
    internal System.Windows.Forms.TreeView treeDB;
    internal System.Windows.Forms.Panel Panel1;
    internal System.Windows.Forms.Button cmdClose;
    internal System.Windows.Forms.GroupBox GroupBox1;
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ruponentModel.Container components = null;
    public TreeViewDataBinding()
    {
      //
      // Required for Windows Form Designer support
      //
      InitializeComponent();
      //
      // TODO: Add any constructor code after InitializeComponent call
      //
    }
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    protected override void Dispose( bool disposing )
    {
      if( disposing )
      {
        if (components != null) 
        {
          components.Dispose();
        }
      }
      base.Dispose( disposing );
    }
    #region Windows Form Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
      this.Panel2 = new System.Windows.Forms.Panel();
      this.Panel3 = new System.Windows.Forms.Panel();
      this.lblInfo = new System.Windows.Forms.Label();
      this.Label1 = new System.Windows.Forms.Label();
      this.Splitter1 = new System.Windows.Forms.Splitter();
      this.treeDB = new System.Windows.Forms.TreeView();
      this.Panel1 = new System.Windows.Forms.Panel();
      this.cmdClose = new System.Windows.Forms.Button();
      this.GroupBox1 = new System.Windows.Forms.GroupBox();
      this.Panel2.SuspendLayout();
      this.Panel3.SuspendLayout();
      this.Panel1.SuspendLayout();
      this.SuspendLayout();
      // 
      // Panel2
      // 
      this.Panel2.Controls.AddRange(new System.Windows.Forms.Control[] {
                                         this.Panel3,
                                         this.Splitter1,
                                         this.treeDB});
      this.Panel2.Dock = System.Windows.Forms.DockStyle.Fill;
      this.Panel2.Location = new System.Drawing.Point(5, 5);
      this.Panel2.Name = "Panel2";
      this.Panel2.Size = new System.Drawing.Size(446, 264);
      this.Panel2.TabIndex = 8;
      // 
      // Panel3
      // 
      this.Panel3.Controls.AddRange(new System.Windows.Forms.Control[] {
                                         this.lblInfo,
                                         this.Label1});
      this.Panel3.Dock = System.Windows.Forms.DockStyle.Fill;
      this.Panel3.Location = new System.Drawing.Point(239, 0);
      this.Panel3.Name = "Panel3";
      this.Panel3.Size = new System.Drawing.Size(207, 264);
      this.Panel3.TabIndex = 7;
      // 
      // lblInfo
      // 
      this.lblInfo.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
        | System.Windows.Forms.AnchorStyles.Left) 
        | System.Windows.Forms.AnchorStyles.Right);
      this.lblInfo.BackColor = System.Drawing.SystemColors.Window;
      this.lblInfo.Location = new System.Drawing.Point(16, 12);
      this.lblInfo.Name = "lblInfo";
      this.lblInfo.Size = new System.Drawing.Size(176, 240);
      this.lblInfo.TabIndex = 1;
      // 
      // Label1
      // 
      this.Label1.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
        | System.Windows.Forms.AnchorStyles.Left) 
        | System.Windows.Forms.AnchorStyles.Right);
      this.Label1.BackColor = System.Drawing.SystemColors.Window;
      this.Label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
      this.Label1.Location = new System.Drawing.Point(4, 0);
      this.Label1.Name = "Label1";
      this.Label1.Size = new System.Drawing.Size(200, 264);
      this.Label1.TabIndex = 2;
      // 
      // Splitter1
      // 
      this.Splitter1.Location = new System.Drawing.Point(236, 0);
      this.Splitter1.Name = "Splitter1";
      this.Splitter1.Size = new System.Drawing.Size(3, 264);
      this.Splitter1.TabIndex = 6;
      this.Splitter1.TabStop = false;
      // 
      // treeDB
      // 
      this.treeDB.Dock = System.Windows.Forms.DockStyle.Left;
      this.treeDB.ImageIndex = -1;
      this.treeDB.Name = "treeDB";
      this.treeDB.SelectedImageIndex = -1;
      this.treeDB.Size = new System.Drawing.Size(236, 264);
      this.treeDB.TabIndex = 4;
      this.treeDB.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeDB_AfterSelect);
      this.treeDB.BeforeExpand += new System.Windows.Forms.TreeViewCancelEventHandler(this.treeDB_BeforeExpand);
      // 
      // Panel1
      // 
      this.Panel1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                         this.cmdClose,
                                         this.GroupBox1});
      this.Panel1.Dock = System.Windows.Forms.DockStyle.Bottom;
      this.Panel1.Location = new System.Drawing.Point(5, 269);
      this.Panel1.Name = "Panel1";
      this.Panel1.Size = new System.Drawing.Size(446, 36);
      this.Panel1.TabIndex = 7;
      // 
      // cmdClose
      // 
      this.cmdClose.Anchor = (System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right);
      this.cmdClose.FlatStyle = System.Windows.Forms.FlatStyle.System;
      this.cmdClose.Location = new System.Drawing.Point(372, 12);
      this.cmdClose.Name = "cmdClose";
      this.cmdClose.Size = new System.Drawing.Size(72, 24);
      this.cmdClose.TabIndex = 4;
      this.cmdClose.Text = "Close";
      this.cmdClose.Click += new System.EventHandler(this.cmdClose_Click);
      // 
      // GroupBox1
      // 
      this.GroupBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
        | System.Windows.Forms.AnchorStyles.Right);
      this.GroupBox1.Name = "GroupBox1";
      this.GroupBox1.Size = new System.Drawing.Size(444, 8);
      this.GroupBox1.TabIndex = 5;
      this.GroupBox1.TabStop = false;
      // 
      // TreeViewDataBinding
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
      this.ClientSize = new System.Drawing.Size(456, 310);
      this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                      this.Panel2,
                                      this.Panel1});
      this.DockPadding.All = 5;
      this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
      this.Name = "TreeViewDataBinding";
      this.Text = "TreeViewDataBinding";
      this.Load += new System.EventHandler(this.TreeViewDataBinding_Load);
      this.Panel2.ResumeLayout(false);
      this.Panel3.ResumeLayout(false);
      this.Panel1.ResumeLayout(false);
      this.ResumeLayout(false);
    }
    #endregion
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main() 
    {
      Application.Run(new TreeViewDataBinding());
    }
    private ProductDatabase DataClass = new ProductDatabase();
    private void TreeViewDataBinding_Load(object sender, System.EventArgs e)
    {
      TreeNode nodeParent;
      foreach (DataRow row in DataClass.GetCategories().Rows)
      {
        // Add the category node.
        nodeParent = treeDB.Nodes.Add(row[ProductDatabase.CategoryField.Name].ToString());
        nodeParent.ImageIndex = 0;
        // Store the disconnected category information.
        nodeParent.Tag = row;
        // Add a "dummy" node.
        nodeParent.Nodes.Add("*");
      }
    
    }
    private void treeDB_BeforeExpand(object sender, System.Windows.Forms.TreeViewCancelEventArgs e)
    {
      TreeNode nodeSelected, nodeChild;
      nodeSelected = e.Node;
      if (nodeSelected.Nodes[0].Text == "*")
      {
        // This is a dummy node.
        nodeSelected.Nodes.Clear();
        foreach (DataRow row in
          DataClass.GetProductsInCategory((DataRow)nodeSelected.Tag))
        {
          nodeChild = nodeSelected.Nodes.Add(row[ProductDatabase.ProductField.Name].ToString());
          // Store the disconnected product information.
          nodeChild.Tag = row;
          nodeChild.ImageIndex = 1;
          nodeChild.SelectedImageIndex = 1;
        }
      }
    }
    private void treeDB_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
    {
       lblInfo.Text = DataClass.GetDisplayText((DataRow)e.Node.Tag);
    }
    private void cmdClose_Click(object sender, System.EventArgs e)
    {
      this.Close();
    }
  }

  public class ProductDatabase
  {
    public class Tables
    {
      public const string Product = "Products";
      public const string Category = "Categories";
    }
    public class ProductField
    {
      public const string Name = "ModelName";
      public const string Description = "Description";
    }
    public class CategoryField
    {
      public const string Name = "CategoryName";
    }
    private DataSet dsStore;
    DataRelation relCategoryProduct;
    public ProductDatabase()
    {
      dsStore = new DataSet();
      dsStore.ReadXmlSchema(Application.StartupPath + "\\store.xsd");
      dsStore.ReadXml(Application.StartupPath + "\\store.xml");
      // Define the relation.
      relCategoryProduct = new DataRelation("Prod_Cat", 
        dsStore.Tables["Categories"].Columns["CategoryID"], 
        dsStore.Tables["Products"].Columns["CategoryID"]);
      dsStore.Relations.Add(relCategoryProduct);
    }
    public DataTable GetCategories()
    {
      return dsStore.Tables["Categories"];
    }
    public DataRow[] GetProductsInCategory(DataRow rowParent)
    {
      return rowParent.GetChildRows(relCategoryProduct);
    }
    public string GetDisplayText(DataRow row)
    {
      string text = "";
      switch (row.Table.TableName)
      {
        case Tables.Product:
          text = "ID: " + row[0] + "\n";
          text += "Name: " + row[ProductField.Name] + "\n\n";
          text += row[ProductField.Description];
          break;
      }
      return text;
    }
  }
}

TreeView.Dock

 
using System;
using System.Drawing;
using System.Windows.Forms;
   
class SimpleTreeView: Form
{
     public static void Main()
     {
          Application.Run(new SimpleTreeView());
     }
     public SimpleTreeView()
     {
          Text = "Simple Tree View";
   
          TreeView tree = new TreeView();
          tree.Parent = this;
          tree.Dock = DockStyle.Fill;
   
          tree.Nodes.Add("Animal");
          tree.Nodes[0].Nodes.Add("A");
          tree.Nodes[0].Nodes[0].Nodes.Add("A1");
          tree.Nodes[0].Nodes[0].Nodes.Add("A2");
          tree.Nodes[0].Nodes[0].Nodes.Add("A3");
          tree.Nodes[0].Nodes.Add("B");
          tree.Nodes[0].Nodes[1].Nodes.Add("B1");
          tree.Nodes[0].Nodes[1].Nodes.Add("B2");
          tree.Nodes[0].Nodes.Add("C");
          tree.Nodes[0].Nodes[2].Nodes.Add("C1");
          tree.Nodes[0].Nodes[2].Nodes.Add("C2");
          tree.Nodes[0].Nodes[2].Nodes.Add("C3");
          tree.Nodes.Add("D");
          tree.Nodes[1].Nodes.Add("D1");
          tree.Nodes[1].Nodes.Add("D2");
          tree.Nodes[1].Nodes.Add("D3");
          tree.Nodes.Add("E");
          tree.Nodes[2].Nodes.Add("E1");
          tree.Nodes[2].Nodes.Add("E2");
          tree.Nodes[2].Nodes.Add("E3");
     }
}

TreeView.DoDragDrop

 

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form
{
  private System.Windows.Forms.SplitContainer splitContainer1;
  private System.Windows.Forms.TreeView treeOne;
  private System.Windows.Forms.TreeView treeTwo;
  public Form1() {
        InitializeComponent();
    TreeNode node = treeOne.Nodes.Add("A");
    node.Nodes.Add("A1");
    node.Nodes.Add("A2");
    node.Expand();
    node = treeTwo.Nodes.Add("B");
    node.Nodes.Add("B1");
    node.Nodes.Add("B2");
    node.Expand();
    treeTwo.AllowDrop = true;
    treeOne.AllowDrop = true;
  }
  private void tree_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
  {
    TreeView tree = (TreeView)sender;
    TreeNode node = tree.GetNodeAt(e.X, e.Y);
    tree.SelectedNode = node;
    if (node != null)
    {
      tree.DoDragDrop(node, DragDropEffects.Copy);
    }
  }
  private void tree_DragOver(object sender, System.Windows.Forms.DragEventArgs e)
  {
    TreeView tree = (TreeView)sender;
    e.Effect = DragDropEffects.None;
    TreeNode nodeSource = (TreeNode)e.Data.GetData(typeof(TreeNode));
    if (nodeSource != null)
    {
      if (nodeSource.TreeView != tree)
      {
        Point pt = new Point(e.X, e.Y);
        pt = tree.PointToClient(pt);
        TreeNode nodeTarget = tree.GetNodeAt(pt);
        if (nodeTarget != null)
        {
          e.Effect = DragDropEffects.Copy;
          tree.SelectedNode = nodeTarget;
        }
      }
    }
  }
  private void tree_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
  {
    TreeView tree = (TreeView)sender;
    Point pt = new Point(e.X, e.Y);
    pt = tree.PointToClient(pt);
    TreeNode nodeTarget = tree.GetNodeAt(pt);
    TreeNode nodeSource = (TreeNode)e.Data.GetData(typeof(TreeNode));
    nodeTarget.Nodes.Add((TreeNode)nodeSource.Clone());
    nodeTarget.Expand();
  }
  private void InitializeComponent()
  {
        this.splitContainer1 = new System.Windows.Forms.SplitContainer();
        this.treeOne = new System.Windows.Forms.TreeView();
        this.treeTwo = new System.Windows.Forms.TreeView();
        this.splitContainer1.Panel1.SuspendLayout();
        this.splitContainer1.Panel2.SuspendLayout();
        this.splitContainer1.SuspendLayout();
        this.SuspendLayout();
        // 
        // splitContainer1
        // 
        this.splitContainer1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.splitContainer1.Location = new System.Drawing.Point(0, 0);
        this.splitContainer1.Name = "splitContainer1";
        // 
        // splitContainer1.Panel1
        // 
        this.splitContainer1.Panel1.Controls.Add(this.treeOne);
        // 
        // splitContainer1.Panel2
        // 
        this.splitContainer1.Panel2.Controls.Add(this.treeTwo);
        this.splitContainer1.Size = new System.Drawing.Size(456, 391);
        this.splitContainer1.SplitterDistance = 238;
        this.splitContainer1.TabIndex = 0;
        this.splitContainer1.Text = "splitContainer1";
        // 
        // treeOne
        // 
        this.treeOne.Dock = System.Windows.Forms.DockStyle.Left;
        this.treeOne.HideSelection = false;
        this.treeOne.Location = new System.Drawing.Point(0, 0);
        this.treeOne.Name = "treeOne";
        this.treeOne.Size = new System.Drawing.Size(236, 391);
        this.treeOne.TabIndex = 5;
        this.treeOne.DragDrop += new System.Windows.Forms.DragEventHandler(this.tree_DragDrop);
        this.treeOne.DragOver += new System.Windows.Forms.DragEventHandler(this.tree_DragOver);
        this.treeOne.MouseDown += new System.Windows.Forms.MouseEventHandler(this.tree_MouseDown);
        // 
        // treeTwo
        // 
        this.treeTwo.Dock = System.Windows.Forms.DockStyle.Fill;
        this.treeTwo.Location = new System.Drawing.Point(0, 0);
        this.treeTwo.Name = "treeTwo";
        this.treeTwo.Size = new System.Drawing.Size(214, 391);
        this.treeTwo.TabIndex = 7;
        this.treeTwo.DragDrop += new System.Windows.Forms.DragEventHandler(this.tree_DragDrop);
        this.treeTwo.DragOver += new System.Windows.Forms.DragEventHandler(this.tree_DragOver);
        this.treeTwo.MouseDown += new System.Windows.Forms.MouseEventHandler(this.tree_MouseDown);
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(456, 391);
        this.Controls.Add(this.splitContainer1);
        this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.Name = "Form1";
        this.Text = "TreeView Drag-And-Drop";
        this.splitContainer1.Panel1.ResumeLayout(false);
        this.splitContainer1.Panel2.ResumeLayout(false);
        this.splitContainer1.ResumeLayout(false);
        this.ResumeLayout(false);
  }
  [STAThread]
  static void Main()
  {
    Application.EnableVisualStyles();
    Application.Run(new Form1());
  }
}

TreeView.DoubleClick

 

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form
{
  private System.Windows.Forms.SplitContainer splitContainer1;
  private System.Windows.Forms.TreeView treeOne;
  private System.Windows.Forms.TreeView treeTwo;
  public Form1() {
        InitializeComponent();
    TreeNode node = treeOne.Nodes.Add("A");
    node.Nodes.Add("A1");
    node.Nodes.Add("A2");
    node.Expand();
    node = treeTwo.Nodes.Add("B");
    node.Nodes.Add("B1");
    node.Nodes.Add("B2");
    node.Expand();
  }
    private void tree_DoubleClick(object sender, EventArgs e)
    {
       MessageBox.Show(((TreeView)sender).SelectedNode.FullPath);
    }
  private void InitializeComponent()
  {
        this.splitContainer1 = new System.Windows.Forms.SplitContainer();
        this.treeOne = new System.Windows.Forms.TreeView();
        this.treeTwo = new System.Windows.Forms.TreeView();
        this.splitContainer1.Panel1.SuspendLayout();
        this.splitContainer1.Panel2.SuspendLayout();
        this.splitContainer1.SuspendLayout();
        this.SuspendLayout();
        // 
        // splitContainer1
        // 
        this.splitContainer1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.splitContainer1.Location = new System.Drawing.Point(0, 0);
        this.splitContainer1.Name = "splitContainer1";
        // 
        // splitContainer1.Panel1
        // 
        this.splitContainer1.Panel1.Controls.Add(this.treeOne);
        // 
        // splitContainer1.Panel2
        // 
        this.splitContainer1.Panel2.Controls.Add(this.treeTwo);
        this.splitContainer1.Size = new System.Drawing.Size(456, 391);
        this.splitContainer1.SplitterDistance = 238;
        this.splitContainer1.TabIndex = 0;
        this.splitContainer1.Text = "splitContainer1";
        // 
        // treeOne
        // 
        this.treeOne.Dock = System.Windows.Forms.DockStyle.Left;
        this.treeOne.HideSelection = false;
        this.treeOne.Location = new System.Drawing.Point(0, 0);
        this.treeOne.Name = "treeOne";
        this.treeOne.Size = new System.Drawing.Size(236, 391);
        this.treeOne.TabIndex = 5;
        this.treeOne.DoubleClick += new System.EventHandler(this.tree_DoubleClick);
        // 
        // treeTwo
        // 
        this.treeTwo.Dock = System.Windows.Forms.DockStyle.Fill;
        this.treeTwo.Location = new System.Drawing.Point(0, 0);
        this.treeTwo.Name = "treeTwo";
        this.treeTwo.Size = new System.Drawing.Size(214, 391);
        this.treeTwo.TabIndex = 7;
        this.treeTwo.DoubleClick += new System.EventHandler(this.tree_DoubleClick);
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(456, 391);
        this.Controls.Add(this.splitContainer1);
        this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.Name = "Form1";
        this.Text = "TreeView Drag-And-Drop";
        this.splitContainer1.Panel1.ResumeLayout(false);
        this.splitContainer1.Panel2.ResumeLayout(false);
        this.splitContainer1.ResumeLayout(false);
        this.ResumeLayout(false);
  }
  [STAThread]
  static void Main()
  {
    Application.EnableVisualStyles();
    Application.Run(new Form1());
  }
}

TreeView.DragOver

 

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace TreeViewDragAndDrop
{
    /// <summary>
    /// Summary description for TreeViewDragAndDrop.
    /// </summary>
    public class TreeViewDragAndDrop : System.Windows.Forms.Form
    {
        internal System.Windows.Forms.TreeView treeTwo;
        internal System.Windows.Forms.Splitter Splitter1;
        internal System.Windows.Forms.TreeView treeOne;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public TreeViewDragAndDrop()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.treeTwo = new System.Windows.Forms.TreeView();
            this.Splitter1 = new System.Windows.Forms.Splitter();
            this.treeOne = new System.Windows.Forms.TreeView();
            this.SuspendLayout();
            // 
            // treeTwo
            // 
            this.treeTwo.Dock = System.Windows.Forms.DockStyle.Fill;
            this.treeTwo.HideSelection = false;
            this.treeTwo.ImageIndex = -1;
            this.treeTwo.Location = new System.Drawing.Point(239, 0);
            this.treeTwo.Name = "treeTwo";
            this.treeTwo.SelectedImageIndex = -1;
            this.treeTwo.Size = new System.Drawing.Size(281, 366);
            this.treeTwo.TabIndex = 6;
            this.treeTwo.MouseDown += new System.Windows.Forms.MouseEventHandler(this.tree_MouseDown);
            this.treeTwo.DragOver += new System.Windows.Forms.DragEventHandler(this.tree_DragOver);
            this.treeTwo.DragDrop += new System.Windows.Forms.DragEventHandler(this.tree_DragDrop);
            // 
            // Splitter1
            // 
            this.Splitter1.Location = new System.Drawing.Point(236, 0);
            this.Splitter1.Name = "Splitter1";
            this.Splitter1.Size = new System.Drawing.Size(3, 366);
            this.Splitter1.TabIndex = 5;
            this.Splitter1.TabStop = false;
            // 
            // treeOne
            // 
            this.treeOne.Dock = System.Windows.Forms.DockStyle.Left;
            this.treeOne.HideSelection = false;
            this.treeOne.ImageIndex = -1;
            this.treeOne.Name = "treeOne";
            this.treeOne.SelectedImageIndex = -1;
            this.treeOne.Size = new System.Drawing.Size(236, 366);
            this.treeOne.TabIndex = 4;
            this.treeOne.MouseDown += new System.Windows.Forms.MouseEventHandler(this.tree_MouseDown);
            this.treeOne.DragOver += new System.Windows.Forms.DragEventHandler(this.tree_DragOver);
            this.treeOne.DragDrop += new System.Windows.Forms.DragEventHandler(this.tree_DragDrop);
            // 
            // TreeViewDragAndDrop
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
            this.ClientSize = new System.Drawing.Size(520, 366);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.treeTwo,
                                                                          this.Splitter1,
                                                                          this.treeOne});
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
            this.Name = "TreeViewDragAndDrop";
            this.Text = "TreeView Drag-And-Drop";
            this.Load += new System.EventHandler(this.TreeViewDragAndDrop_Load);
            this.ResumeLayout(false);
        }
        #endregion
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new TreeViewDragAndDrop());
        }
        private void TreeViewDragAndDrop_Load(object sender, System.EventArgs e)
        {
            TreeNode node = treeOne.Nodes.Add("Fruits");
            node.Nodes.Add("Apple");
            node.Nodes.Add("Peach");
            node.Expand();
            
            node = treeTwo.Nodes.Add("Vegetables");
            node.Nodes.Add("Tomato");
            node.Nodes.Add("Eggplant");
            node.Expand();
            
            treeTwo.AllowDrop = true;
            treeOne.AllowDrop = true;
        }
        private void tree_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) 
        {
            // Get the tree.
            TreeView tree = (TreeView)sender;
            // Get the node underneath the mouse.
            TreeNode node = tree.GetNodeAt(e.X, e.Y);
            tree.SelectedNode = node;
            // Start the drag-and-drop operation with a cloned copy of the node.
            if (node != null)
            {
                tree.DoDragDrop(node.Clone(), DragDropEffects.Copy);
            }
        }
        private void tree_DragOver(object sender, System.Windows.Forms.DragEventArgs e)
        {
            // Get the tree.
            TreeView tree = (TreeView)sender;
            // Drag and drop denied by default.
            e.Effect = DragDropEffects.None;
            // Is it a valid format?
            if (e.Data.GetData(typeof(TreeNode)) != null)
            {
                // Get the screen point.
                Point pt = new Point(e.X, e.Y);
                // Convert to a point in the TreeView"s coordinate system.
                pt = tree.PointToClient(pt);
                // Is the mouse over a valid node?
                TreeNode node = tree.GetNodeAt(pt);
                if (node != null)
                {
                    e.Effect = DragDropEffects.Copy;
                    tree.SelectedNode = node;
                }
            }
        }
        private void tree_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
        {
            // Get the tree.
            TreeView tree = (TreeView)sender;
            // Get the screen point.
            Point pt = new Point(e.X, e.Y);
            // Convert to a point in the TreeView"s coordinate system.
            pt = tree.PointToClient(pt);
            // Get the node underneath the mouse.
            TreeNode node = tree.GetNodeAt(pt);
            // Add a child node.
            node.Nodes.Add((TreeNode)e.Data.GetData(typeof(TreeNode)));
            // Show the newly added node if it is not already visible.
            node.Expand();
        }
    }
}

TreeView.HotTracking

 
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form {
    private System.Windows.Forms.TreeView treeView1;
    ImageList il = new ImageList();
    public Form1() {
        this.treeView1 = new System.Windows.Forms.TreeView();
        this.SuspendLayout();
        this.treeView1.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
           | System.Windows.Forms.AnchorStyles.Left)
           | System.Windows.Forms.AnchorStyles.Right);
        this.treeView1.Font = new System.Drawing.Font("Courier New", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
        this.treeView1.HotTracking = true;
        this.treeView1.ImageIndex = -1;
        this.treeView1.Indent = 30;
        this.treeView1.ItemHeight = 30;
        this.treeView1.LabelEdit = true;
        this.treeView1.Location = new System.Drawing.Point(8, 16);
        this.treeView1.SelectedImageIndex = -1;
        this.treeView1.Size = new System.Drawing.Size(360, 272);
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(376, 309);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                      this.treeView1});
        this.Text = "TreeView Control";
        this.Load += new System.EventHandler(this.Form1_Load);
        this.ResumeLayout(false);
    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
    private void Form1_Load(object sender, System.EventArgs e) {
        il.Images.Add(new Icon("1.ICO"));
        il.Images.Add(new Icon("2.ICO"));
        il.Images.Add(new Icon("3.ICO"));
        il.Images.Add(new Icon("4.ICO"));
        treeView1.ImageList = il;
        TreeNode rootNode = treeView1.Nodes.Add("USA");
        rootNode.ImageIndex = 0;
        TreeNode states1 = rootNode.Nodes.Add("a");
        states1.ImageIndex = 1;
        TreeNode states2 = rootNode.Nodes.Add("b");
        states2.ImageIndex = 1;
        TreeNode states3 = rootNode.Nodes.Add("c");
        states3.ImageIndex = 1;
        TreeNode states4 = rootNode.Nodes.Add("d");
        states4.ImageIndex = 1;
        TreeNode child = states1.Nodes.Add("A");
        child.ImageIndex = 2;
        child = states1.Nodes.Add("e");
        child.ImageIndex = 2;
        child = states1.Nodes.Add("f");
        child.ImageIndex = 2;
        child = states2.Nodes.Add("g");
        child.ImageIndex = 2;
        child = states2.Nodes.Add("h");
        child.ImageIndex = 2;
        child = states2.Nodes.Add("i");
        child.ImageIndex = 2;
        child = states3.Nodes.Add("j");
        child.ImageIndex = 2;
        child = states3.Nodes.Add("k");
        child.ImageIndex = 2;
        child = states3.Nodes.Add("l");
        child.ImageIndex = 2;
        child = states4.Nodes.Add("m");
        child.ImageIndex = 2;
        child = states4.Nodes.Add("n");
        child.ImageIndex = 2;
        child = states4.Nodes.Add("o");
        child.ImageIndex = 2;
    }
}

TreeView.LabelEdit

 
/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace TreeView
{
  /// <summary>
  /// Summary description for TreeViewDemo.
  /// </summary>
  public class TreeViewDemo : System.Windows.Forms.Form
  {
    private System.Windows.Forms.TreeView treeView1;
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ruponentModel.Container components = null;
    ImageList il = new ImageList();
    public TreeViewDemo()
    {
      //
      // Required for Windows Form Designer support
      //
      InitializeComponent();
      //
      // TODO: Add any constructor code after InitializeComponent call
      //
    }
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    protected override void Dispose( bool disposing )
    {
      if( disposing )
      {
        if (components != null) 
        {
          components.Dispose();
        }
      }
      base.Dispose( disposing );
    }
    #region Windows Form Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
         this.treeView1 = new System.Windows.Forms.TreeView();
         this.SuspendLayout();
         // 
         // treeView1
         // 
         this.treeView1.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
            | System.Windows.Forms.AnchorStyles.Left) 
            | System.Windows.Forms.AnchorStyles.Right);
         this.treeView1.Font = new System.Drawing.Font("Courier New", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
         this.treeView1.HotTracking = true;
         this.treeView1.ImageIndex = -1;
         this.treeView1.Indent = 30;
         this.treeView1.ItemHeight = 30;
         this.treeView1.LabelEdit = true;
         this.treeView1.Location = new System.Drawing.Point(8, 16);
         this.treeView1.Name = "treeView1";
         this.treeView1.SelectedImageIndex = -1;
         this.treeView1.Size = new System.Drawing.Size(360, 272);
         this.treeView1.TabIndex = 0;
         // 
         // TreeViewDemo
         // 
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(376, 309);
         this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                      this.treeView1});
         this.Name = "TreeViewDemo";
         this.Text = "TreeView Control";
         this.Load += new System.EventHandler(this.TreeViewDemo_Load);
         this.ResumeLayout(false);
      }
    #endregion
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main() 
    {
      Application.Run(new TreeViewDemo());
    }
    private void TreeViewDemo_Load(object sender, System.EventArgs e)
    {
      // Select icons into the image list
      il.Images.Add(new Icon("KEY04.ICO"));
      il.Images.Add(new Icon("ARW06LT.ICO"));
      il.Images.Add(new Icon("LITENING.ICO"));
      il.Images.Add(new Icon("ARW06UP.ICO"));
      treeView1.ImageList = il ; 
  
      // Create the RootNode
      TreeNode rootNode = treeView1.Nodes.Add("USA");
      rootNode.ImageIndex =0 ;
      // Create the Child nodes for the root
      TreeNode states1 = rootNode.Nodes.Add("New York");
      states1.ImageIndex =1 ;
      TreeNode states2 = rootNode.Nodes.Add("Michigan");
      states2.ImageIndex =1 ;
      TreeNode states3 = rootNode.Nodes.Add("Wisconsin");
      states3.ImageIndex =1 ;
      TreeNode states4 = rootNode.Nodes.Add("California");
      states4.ImageIndex =1 ;
      // Create siblings nodes for the Child nodes 
      TreeNode child = states1.Nodes.Add("Rochester");
      child.ImageIndex = 2 ;
      child =states1.Nodes.Add("new York");
      child.ImageIndex = 2 ;
      child =states1.Nodes.Add("Albany");
      child.ImageIndex = 2 ;
      child = states2.Nodes.Add("Detroit");
      child.ImageIndex = 2 ;
      child =states2.Nodes.Add("Ann Arbor");
      child.ImageIndex = 2 ;
      child =states2.Nodes.Add("Lansing");
      child.ImageIndex = 2 ;
      child = states3.Nodes.Add("Milwaukee");
      child.ImageIndex = 2 ;
      child =states3.Nodes.Add("Madison");
      child.ImageIndex = 2 ;
      child =states3.Nodes.Add("La Cross");
      child.ImageIndex = 2 ;
    
      child = states4.Nodes.Add("Los Angeles");
      child.ImageIndex = 2 ;
      child =states4.Nodes.Add("San Fransisco");
      child.ImageIndex = 2 ;
      child =states4.Nodes.Add("San Diego");
      child.ImageIndex = 2 ;
    }
  }
}