Export (0) Print
Expand All

ListBox.SelectionMode Property

Gets or sets the selection mode of the ListBox control.

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

public virtual ListSelectionMode SelectionMode { get; set; }
<asp:ListBox SelectionMode="ListSelectionMode" />

Property Value

Type: System.Web.UI.WebControls.ListSelectionMode
One of the ListSelectionMode values. The default value is Single.

ExceptionCondition
ArgumentOutOfRangeException

The specified selection mode is not one of the ListSelectionMode values.

Use the SelectionMode property to specify the mode behavior of the ListBox control. Setting this property to ListSelectionMode.Single indicates only a single item can be selected from the ListBox control, while ListSelectionMode.Multiple specifies multiple items can be selected.

The value of the SelectionMode property is stored in view state.

TopicLocation
How to: Add ListBox Web Server Controls to a Web Forms PageBuilding ASP .NET Web Applications
How to: Add ListBox Web Server Controls to a Web Forms PageBuilding ASP .NET Web Applications
How to: Set the Selection in List Web Server Controls (Visual Studio)Building ASP .NET Web Applications in Visual Studio

The following example illustrates how to use the SelectionMode property to allow the user to select multiple selections from the ListBox control.

<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>ListBox Example</title>
<script runat="server">

      void SubmitBtn_Click(Object sender, EventArgs e) 
      {

         Message.Text = "You chose: <br />";

         // Iterate through the Items collection of the ListBox and  
         // display the selected items. 
         foreach (ListItem item in ListBox1.Items)
         {

            if(item.Selected)
            {

               Message.Text += item.Text + "<br />";

            }

         }

      }

   </script>

</head>
<body>

   <h3>ListBox Example</h3>

   <form id="form1" runat="server">

      Select items from the list and click Submit. <br />

      <asp:ListBox id="ListBox1" 
           Rows="6"
           Width="100px"
           SelectionMode="Multiple" 
           runat="server">

         <asp:ListItem Selected="True">Item 1</asp:ListItem>
         <asp:ListItem>Item 2</asp:ListItem>
         <asp:ListItem>Item 3</asp:ListItem>
         <asp:ListItem>Item 4</asp:ListItem>
         <asp:ListItem>Item 5</asp:ListItem>
         <asp:ListItem>Item 6</asp:ListItem>

      </asp:ListBox>

      <br /><br />

      <asp:button id="Button1"
           Text="Submit" 
           OnClick="SubmitBtn_Click" 
           runat="server" />

      <br /><br />

      <asp:Label id="Message" 
           runat="server"/>

   </form>

</body>
</html>

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Community Additions

ADD
Show:
© 2014 Microsoft