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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; }
/** @property */
public ListSelectionMode get_SelectionMode ()

/** @property */
public void set_SelectionMode (ListSelectionMode value)

public function get SelectionMode () : ListSelectionMode

public function set SelectionMode (value : ListSelectionMode)

Property Value

One of the ListSelectionMode values. The default value is Single.

Exception typeCondition

ArgumentException

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" %>
<html>
<head>

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

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