в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:15:06Z

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==Directory TreeView==

<source lang="csharp">using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
class MyClass : Form
{
public static void Main()
{
Application.Run(new MyClass());
}
public MyClass()
{
TreeView tree = new TreeView();
tree.Parent = this;
tree.Dock = DockStyle.Fill;
TreeNode nodeDriveC = new TreeNode("C:\\");
tree.Nodes.Add(nodeDriveC);
AddDirectories(nodeDriveC);
}
void AddDirectories(TreeNode node)
{
string strPath = node.FullPath;
DirectoryInfo dirinfo = new DirectoryInfo(strPath);
DirectoryInfo[] adirinfo;
adirinfo = dirinfo.GetDirectories();
foreach (DirectoryInfo di in adirinfo)
{
TreeNode nodeDir = new TreeNode(di.Name);
node.Nodes.Add(nodeDir);
AddDirectories(nodeDir);
}
}
}</source>

==Hierarchical Tree View for displaying database table==

<source lang="csharp">using System.Data;
using System.Data.SqlClient;
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
public class HierarchicalTreeView : System.Windows.Forms.Form
{
private System.Windows.Forms.TreeView tree;
public HierarchicalTreeView()
{
this.tree = new System.Windows.Forms.TreeView();
this.SuspendLayout();
//
this.tree.ImageIndex = -1;
this.tree.Location = new System.Drawing.Point(8, 8);
this.tree.Name = "tree";
this.tree.SelectedImageIndex = -1;
this.tree.Size = new System.Drawing.Size(276, 248);
this.tree.TabIndex = 0;
this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.AddRange(new System.Windows.Forms.Control[] {this.tree});
this.Text = "Hierarchical TreeView";
this.Load += new System.EventHandler(this.HierarchicalTreeView_Load);
this.ResumeLayout(false);
}
string connectionString = "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI";
string categorySQL = "SELECT * FROM Categories";
string productSQL = "SELECT * FROM Products";
private void HierarchicalTreeView_Load(object sender, System.EventArgs e)
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand com = new SqlCommand(categorySQL, con);
SqlDataAdapter adapter = new SqlDataAdapter(com);
DataSet ds = new DataSet();

con.Open();
adapter.Fill(ds, "Categories");
adapter.SelectCommand.rumandText = productSQL;
adapter.Fill(ds, "Products");
con.Close();
DataColumn parentCol = ds.Tables["Categories"].Columns["CategoryID"];
DataColumn childCol = ds.Tables["Products"].Columns["CategoryID"];
DataRelation relation = new DataRelation("Cat_Prod", parentCol, childCol);
ds.Relations.Add(relation);
foreach (DataRow parent in ds.Tables["Categories"].Rows)
{
TreeNode nodeParent = tree.Nodes.Add(parent["CategoryName"].ToString());
foreach (DataRow child in parent.GetChildRows(relation))
{
nodeParent.Nodes.Add(child["ProductName"].ToString());
}
}
}
public static void Main()
{
Application.Run(new HierarchicalTreeView());
}
}</source>

==Simple Treeview==

<source lang="csharp">using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class SimpleTvForm : System.Windows.Forms.Form
{
private System.Windows.Forms.TreeView tvSimple;
private System.Windows.Forms.Button cmdExpandAll;
private System.Windows.Forms.Button cmdCollapseAll;
private System.Windows.Forms.ContextMenu ctxmTvNodes;
private System.Windows.Forms.MenuItem mnuExpandNode;
private System.Windows.Forms.MenuItem mnuCollapseNode;
public SimpleTvForm()
{
this.tvSimple = new System.Windows.Forms.TreeView();
this.ctxmTvNodes = new System.Windows.Forms.ContextMenu();
this.mnuExpandNode = new System.Windows.Forms.MenuItem();
this.mnuCollapseNode = new System.Windows.Forms.MenuItem();
this.cmdExpandAll = new System.Windows.Forms.Button();
this.cmdCollapseAll = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// tvSimple
//
this.tvSimple.ContextMenu = this.ctxmTvNodes;
this.tvSimple.ImageIndex = -1;
this.tvSimple.Location = new System.Drawing.Point(8, 8);
this.tvSimple.Name = "tvSimple";
this.tvSimple.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
new System.Windows.Forms.TreeNode("Continents", new System.Windows.Forms.TreeNode[] {
new System.Windows.Forms.TreeNode("Africa"),
new System.Windows.Forms.TreeNode("America"),
new System.Windows.Forms.TreeNode("Europe"),
new System.Windows.Forms.TreeNode("Asia"),
new System.Windows.Forms.TreeNode("Australia")}),
new System.Windows.Forms.TreeNode("SUV\"s", new System.Windows.Forms.TreeNode[] {
new System.Windows.Forms.TreeNode("Hummer"),
new System.Windows.Forms.TreeNode("Pinzgauer")})});
this.tvSimple.SelectedImageIndex = -1;
this.tvSimple.Size = new System.Drawing.Size(272, 232);
this.tvSimple.TabIndex = 0;
this.tvSimple.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.AfterSelect);
//
// ctxmTvNodes
//
this.ctxmTvNodes.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
this.mnuExpandNode,
this.mnuCollapseNode});
//
// mnuExpandNode
//
this.mnuExpandNode.Index = 0;
this.mnuExpandNode.Text = "Expand node";
this.mnuExpandNode.Click += new System.EventHandler(this.OnExpandNode);
//
// mnuCollapseNode
//
this.mnuCollapseNode.Index = 1;
this.mnuCollapseNode.Text = "Collapse node";
this.mnuCollapseNode.Click += new System.EventHandler(this.OnCollapseNode);
//
// cmdExpandAll
//
this.cmdExpandAll.Location = new System.Drawing.Point(8, 256);
this.cmdExpandAll.Name = "cmdExpandAll";
this.cmdExpandAll.TabIndex = 1;
this.cmdExpandAll.Text = "expand all";
this.cmdExpandAll.Click += new System.EventHandler(this.cmdExpandAll_Click);
//
// cmdCollapseAll
//
this.cmdCollapseAll.Location = new System.Drawing.Point(96, 256);
this.cmdCollapseAll.Name = "cmdCollapseAll";
this.cmdCollapseAll.TabIndex = 2;
this.cmdCollapseAll.Text = "collapse all";
this.cmdCollapseAll.Click += new System.EventHandler(this.cmdCollapseAll_Click);
//
// SimpleTvForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 301);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.cmdCollapseAll,
this.cmdExpandAll,
this.tvSimple});
this.Name = "SimpleTvForm";
this.Text = "Simple";
this.ResumeLayout(false);
}
static void Main()
{
Application.Run(new SimpleTvForm());
}
private void AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
// MessageBox.Show("Node " + e.Node.FullPath + " was selected");
}
private void cmdExpandAll_Click(object sender, System.EventArgs e)
{
tvSimple.ExpandAll();
}
private void cmdCollapseAll_Click(object sender, System.EventArgs e)
{
tvSimple.CollapseAll();
}
private void OnExpandNode(object sender, System.EventArgs e)
{
TreeNode tn = tvSimple.SelectedNode;
if (null == tn) return;
tn.ExpandAll();
}
private void OnCollapseNode(object sender, System.EventArgs e)
{
TreeNode tn = tvSimple.SelectedNode;
if (null == tn) return;
tn.Collapse();
}
}</source>

==Tree node foreground and background color, tooltips==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
treeView1.Nodes.Clear();
treeView1.ShowNodeToolTips = true;
TreeNode evenNumbers = treeView1.Nodes.Add("Even", "Even Numbers", 0,1);
evenNumbers.BackColor = Color.Blue;
evenNumbers.ForeColor = Color.Yellow;
evenNumbers.ToolTipText = "The even numbers";
TreeNode oddNumbers = treeView1.Nodes.Add("Odd", "Odd Numbers", 0,1);
oddNumbers.BackColor = Color.Yellow;
oddNumbers.ForeColor = Color.Blue;
oddNumbers.ToolTipText = "The odd numbers";
for (int i = 1; i < 50; i++)
{
if (i % 2 == 0)
{
evenNumbers.Nodes.Add(i.ToString());
} else {
oddNumbers.Nodes.Add(i.ToString() );
}
}
}
private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
{
TreeNode selectedNode = e.Node;
if (selectedNode.Nodes.ContainsKey("1"))
{
Console.WriteLine("This node contains "1"");
}
}
}
partial class Form1
{
private void InitializeComponent()
{
this.treeView1 = new System.Windows.Forms.TreeView();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// treeView1
//
this.treeView1.Location = new System.Drawing.Point(16, 50);
this.treeView1.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
this.treeView1.Name = "treeView1";
this.treeView1.Size = new System.Drawing.Size(194, 149);
this.treeView1.TabIndex = 0;
this.treeView1.NodeMouseClick += new System.Windows.Forms.TreeNodeMouseClickEventHandler(this.treeView1_NodeMouseClick);
//
// button1
//
this.button1.Location = new System.Drawing.Point(16, 15);
this.button1.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(100, 28);
this.button1.TabIndex = 1;
this.button1.Text = "Load";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(229, 213);
this.Controls.Add(this.button1);
this.Controls.Add(this.treeView1);
this.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
private System.Windows.Forms.TreeView treeView1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.ImageList imageList1;
}
public class TreeViewNodeBackgroundForegroundTooltip
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}</source>

==TreeView: Add Nodes==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
treeView1.Nodes.Clear();
TreeNode evenNumbers = treeView1.Nodes.Add("Even Numbers");
TreeNode oddNumbers = treeView1.Nodes.Add("Odd Numbers");
for (int i = 1; i < 500; i++)
{
if (i % 2 == 0)
{
evenNumbers.Nodes.Add(i.ToString());
} else {
oddNumbers.Nodes.Add(i.ToString() );
}
}
}
}
partial class Form1
{
private void InitializeComponent()
{
this.treeView1 = new System.Windows.Forms.TreeView();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// treeView1
//
this.treeView1.Location = new System.Drawing.Point(16, 50);
this.treeView1.Margin = new System.Windows.Forms.Padding(4);
this.treeView1.Name = "treeView1";
this.treeView1.Size = new System.Drawing.Size(286, 313);
this.treeView1.TabIndex = 0;
//
// button1
//
this.button1.Location = new System.Drawing.Point(16, 15);
this.button1.Margin = new System.Windows.Forms.Padding(4);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(100, 28);
this.button1.TabIndex = 1;
this.button1.Text = "Load";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(316, 390);
this.Controls.Add(this.button1);
this.Controls.Add(this.treeView1);
this.Margin = new System.Windows.Forms.Padding(4);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
private System.Windows.Forms.TreeView treeView1;
private System.Windows.Forms.Button button1;
}
public class TreeViewAddItems
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}</source>

==TreeView selection event==

<source lang="csharp">using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : Form
{
private TreeView treeView1;
private Splitter splitter1;
private ListView listView1;
public Form1()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.treeView1 = new TreeView();
this.splitter1 = new Splitter();
this.listView1 = new ListView();
this.SuspendLayout();
this.treeView1.Dock = DockStyle.Left;
this.treeView1.Name = "treeView1";
this.treeView1.Nodes.AddRange(new TreeNode[] {new TreeNode("Vehicles", 0, 0, new TreeNode[] {new TreeNode("Cars", 0, 0, new TreeNode[] {new TreeNode("Item1", 0, 0),new TreeNode("Item2", 0, 0)}),new TreeNode("Trucks", 0, 0, new TreeNode[] {
new TreeNode("Pickups"),new TreeNode("Utility vans")})})});
this.treeView1.Size = new System.Drawing.Size(192, 293);
this.treeView1.TabIndex = 0;
this.treeView1.AfterSelect += new TreeViewEventHandler(this.treeView1_AfterSelect);
//
// splitter1
//
this.splitter1.Location = new System.Drawing.Point(192, 0);
this.splitter1.Name = "splitter1";
this.splitter1.Size = new System.Drawing.Size(3, 293);
this.splitter1.TabIndex = 1;
this.splitter1.TabStop = false;
//
// listView1
//
this.listView1.Dock = DockStyle.Fill;
this.listView1.Location = new System.Drawing.Point(195, 0);
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(141, 293);
this.listView1.TabIndex = 2;
this.listView1.View = View.List;
this.listView1.ItemActivate += new System.EventHandler(this.listView1_ItemActivate);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(336, 293);
this.Controls.AddRange(new Control[] {
this.listView1,
this.splitter1,
this.treeView1});
this.Name = "Form1";
this.Text = "Vehicle Hierarchy";
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
switch (e.Node.Text)
{
case "Item1":
listView1.Clear();
listView1.Items.Add("A",3);
listView1.Items.Add("B", 4);
listView1.Items.Add("C", 6);
break;

case "Item2":
listView1.Clear();
listView1.Items.Add("D", 1);
listView1.Items.Add("E", 2);
listView1.Items.Add("F", 5);
break;
}
}

private void listView1_ItemActivate(object sender, System.EventArgs e) {
String strItem = listView1.FocusedItem.Text;
MessageBox.Show(strItem);
}
}</source>

==Use TreeView to display Directories==

<source lang="csharp">/* Quote from
Programming .NET Windows Applications
By Jesse Liberty, Dan Hurwitz
First Edition October 2003
Pages: 1246 (More details)
*/
using System;
using System.Drawing;
using System.Windows.Forms;
using System.IO; // necessary for Directory info
public class TreeViewDirectories : Form
{
TreeView tvw;
CheckBox cb;
Button btnSelected;
Button btnExpand;
Button btnExpandAll;
Button btnCollapse;
Button btnCollapseAll;
Button btnToggle;
public TreeViewDirectories()
{
Size = new Size(400,600);
ImageList imgList = new ImageList();
Image img;
String[] arFiles = {"1.ico","2.ico","3.ico",".ico"};

for (int i = 0; i < arFiles.Length; i++)
{
img = Image.FromFile(arFiles[i]);
imgList.Images.Add(img);
}
tvw = new TreeView();
tvw.Parent = this;
tvw.Location = new Point(10,10);
tvw.Size = new Size(ClientSize.Width - 20, Height - 200);
tvw.Anchor = AnchorStyles.Top | AnchorStyles.Left |
AnchorStyles.Right | AnchorStyles.Bottom;
tvw.BackColor = Color.Moccasin;
tvw.ForeColor = Color.DarkRed;
tvw.BorderStyle = BorderStyle.Fixed3D;
tvw.FullRowSelect = false;
tvw.ShowLines = true;
tvw.ShowPlusMinus = true;
tvw.Scrollable = true;
tvw.HideSelection = false;
tvw.HotTracking = true;
tvw.ImageList = imgList;
tvw.ImageIndex = 1;
tvw.SelectedImageIndex = 2;
tvw.Indent = 35;
tvw.Font = new Font("Times New Roman", 20f);
tvw.ItemHeight = tvw.Font.Height * 2;
tvw.BeforeExpand += new TreeViewCancelEventHandler(tvw_BeforeExpand);
cb = new CheckBox();
cb.Parent = this;
cb.Location = new Point((Width - cb.Width) * 2 / 10, tvw.Bottom + 25);
cb.Text = "Show Files";
cb.Anchor = AnchorStyles.Bottom;
cb.CheckedChanged += new EventHandler(cb_CheckedChanged);
btnSelected = new Button();
btnSelected.Parent = this;
btnSelected.Text = "&SelectedNode";
int xSize = ((int)(Font.Height * .75) * btnSelected.Text.Length);
int ySize = Font.Height + 10;
btnSelected.Size = new Size(xSize, ySize);
btnSelected.Location = new Point(cb.Left, cb.Bottom + ySize);
btnSelected.Anchor = AnchorStyles.Bottom;
btnSelected.Click += new EventHandler(btnSelected_Click);
btnToggle = new Button();
btnToggle.Parent = this;
btnToggle.Location = new Point((Width - cb.Width) * 7 / 10,
cb.Top);
btnToggle.Text = "&Toggle";
btnToggle.Size = new Size(btnSelected.Width, btnSelected.Height);
btnToggle.Anchor = AnchorStyles.Bottom;
btnToggle.Click += new EventHandler(btnToggle_Click);
btnExpand = new Button();
btnExpand.Parent = this;
btnExpand.Location = new Point(btnToggle.Left, btnToggle.Bottom);
btnExpand.Text = "&Expand";
btnExpand.Size = new Size(btnSelected.Width, btnSelected.Height);
btnExpand.Anchor = AnchorStyles.Bottom;
btnExpand.Click += new EventHandler(btnExpand_Click);
btnExpandAll = new Button();
btnExpandAll.Parent = this;
btnExpandAll.Location = new Point(btnExpand.Left, btnExpand.Bottom);
btnExpandAll.Text = "Expand &All";
btnExpandAll.Size = new Size(btnSelected.Width, btnSelected.Height);
btnExpandAll.Anchor = AnchorStyles.Bottom;
btnExpandAll.Click += new EventHandler(btnExpandAll_Click);
btnCollapse = new Button();
btnCollapse.Parent = this;
btnCollapse.Location = new Point(btnExpandAll.Left, btnExpandAll.Bottom);
btnCollapse.Text = "&Collapse";
btnCollapse.Size = new Size(btnSelected.Width, btnSelected.Height);
btnCollapse.Anchor = AnchorStyles.Bottom;
btnCollapse.Click += new EventHandler(btnCollapse_Click);
btnCollapseAll = new Button();
btnCollapseAll.Parent = this;
btnCollapseAll.Location = new Point(btnCollapse.Left, btnCollapse.Bottom);
btnCollapseAll.Text = "Colla&pse All";
btnCollapseAll.Size = new Size(btnSelected.Width, btnSelected.Height);
btnCollapseAll.Anchor = AnchorStyles.Bottom;
btnCollapseAll.Click += new EventHandler(btnCollapseAll_Click);
FillDirectoryTree();
}
static void Main()
{
Application.Run(new TreeViewDirectories());
}
private void FillDirectoryTree()
{
tvw.BeginUpdate();
tvw.Nodes.Clear();
string[] strDrives = Environment.GetLogicalDrives();
foreach (string rootDirectoryName in strDrives)
{
try
{
Directory.GetDirectories(rootDirectoryName);
TreeNode ndRoot = new TreeNode(rootDirectoryName);
tvw.Nodes.Add(ndRoot);
if (ndRoot.Index % 2 == 0)
{
ndRoot.BackColor = Color.LightYellow;
ndRoot.ForeColor = Color.Green;
}
GetSubDirectoryNodes(ndRoot, cb.Checked);
}
catch (System.IO.IOException)
{
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
}

tvw.EndUpdate();

}
private void GetSubDirectoryNodes(TreeNode parentNode, bool getFileNames)
{
DirectoryInfo di = new DirectoryInfo(parentNode.FullPath);
if ((di.Attributes & FileAttributes.Directory) == 0)
{
return;
}
parentNode.Nodes.Clear();
string[] arSubs = Directory.GetDirectories(parentNode.FullPath);
foreach (string subDir in arSubs)
{
DirectoryInfo dirInfo = new DirectoryInfo(subDir);
if ((dirInfo.Attributes & FileAttributes.Hidden)!= 0)
{
continue;
}
TreeNode subNode = new TreeNode(dirInfo.Name);
parentNode.Nodes.Add(subNode);

// Set colors based on Index property.
if (subNode.Index % 2 == 0)
subNode.BackColor = Color.LightPink;
}
if (getFileNames)
{
// Get any files for this node.
string[] files = Directory.GetFiles(parentNode.FullPath);
// After placing the nodes,
// now place the files in that subdirectory.
foreach (string str in files)
{
FileInfo fi = new FileInfo(str);
TreeNode fileNode = new TreeNode(fi.Name);
parentNode.Nodes.Add(fileNode);
// Set the icon
fileNode.ImageIndex = 0;
fileNode.SelectedImageIndex = 3;
// Set colors based on Index property.
if (fileNode.Index % 2 == 0)
fileNode.BackColor = Color.LightGreen;
}
}
} // close GetSubDirectoryNodes

private void cb_CheckedChanged(object sender, EventArgs e)
{
FillDirectoryTree();
}
private void tvw_BeforeExpand(object sender,
TreeViewCancelEventArgs e)
{
tvw.BeginUpdate();
foreach (TreeNode tn in e.Node.Nodes)
{
GetSubDirectoryNodes(tn, cb.Checked);
}
tvw.EndUpdate();
}
private void btnSelected_Click(object sender, EventArgs e)
{
MessageBox.Show(tvw.SelectedNode.ToString() + "\n" +
"FullPath:\t" + tvw.SelectedNode.FullPath.ToString() + "\n" +
"Index:\t" + tvw.SelectedNode.Index.ToString());
}
private void btnExpand_Click(object sender, EventArgs e)
{
tvw.SelectedNode.Expand();
}
private void btnExpandAll_Click(object sender, EventArgs e)
{
tvw.SelectedNode.ExpandAll();
}
private void btnCollapse_Click(object sender, EventArgs e)
{
tvw.SelectedNode.Collapse();
}
private void btnCollapseAll_Click(object sender, EventArgs e)
{
tvw.CollapseAll();
}
private void btnToggle_Click(object sender, EventArgs e)
{
tvw.SelectedNode.Toggle();
}
}</source>

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