TreeView.ShowLines Property

Gets or sets a value indicating whether lines connecting child nodes to parent nodes are displayed.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

public bool ShowLines { get; set; }
/** @property */
public boolean get_ShowLines ()

/** @property */
public void set_ShowLines (boolean value)

public function get ShowLines () : boolean

public function set ShowLines (value : boolean)

Not applicable.

Property Value

true to display lines connecting nodes; otherwise, false. The default is false.

Use the ShowLines property to specify whether the lines that are connecting child nodes to parent nodes are displayed. When this property is set to true, the TreeView control searches the Web-accessible folder that is specified by the LineImagesFolder property for the line images.


If the LineImagesFolder property is not set, the TreeView control will use the built-in, default images (20 x 20 pixels).

The value of this property is stored in view state.

The following code example demonstrates how to use the ShowLines property to display lines connecting nodes in the TreeView control. Be sure to use the Line Designer tool to create a set of line images and place them in a folder named LineImages within the directory for the sample application.

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="" >
  <head runat="server">
    <title>TreeView LineImagesFolderUrl Example</title>
    <form id="form1" runat="server">
      <h3>TreeView LineImagesFolderUrl Example</h3>
      <asp:TreeView id="LinksTreeView"
          <asp:TreeNode Text="Table of Contents"
            <asp:TreeNode Text="Chapter One">
              <asp:TreeNode Text="Section 1.0">
                <asp:TreeNode Text="Topic 1.0.1"/>
                <asp:TreeNode Text="Topic 1.0.2"/>
                <asp:TreeNode Text="Topic 1.0.3"/>
              <asp:TreeNode Text="Section 1.1">
                <asp:TreeNode Text="Topic 1.1.1"/>
                <asp:TreeNode Text="Topic 1.1.2"/>
                <asp:TreeNode Text="Topic 1.1.3"/>
                <asp:TreeNode Text="Topic 1.1.4"/>
            <asp:TreeNode Text="Chapter Two">
              <asp:TreeNode Text="Section 2.0">
                <asp:TreeNode Text="Topic 2.0.1"/>
                <asp:TreeNode Text="Topic 2.0.2"/>

          <asp:TreeNode Text="Appendix A" />
          <asp:TreeNode Text="Appendix B" />
          <asp:TreeNode Text="Appendix C" />


Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0