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DropDownList.SelectedIndex Property

Gets or sets the index of the selected item in the DropDownList control.

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

public override int SelectedIndex { get; set; }
<asp:DropDownList SelectedIndex="Int32" />

Property Value

Type: System.Int32
The index of the selected item in the DropDownList control. The default value is 0, which selects the first item in the list.

Use the SelectedIndex property to programmatically specify or determine the index of the selected item from the DropDownList control. An item is always selected in the DropDownList control. You cannot clear the selection from every item in the list at the same time.

NoteNote

The indexes for the items in the DropDownList control are zero-based.

The following code example demonstrates how to use the SelectedIndex property to determine the selected item in the DropDownList 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" >
   <script runat="server" >

      void Selection_Change(Object sender, EventArgs e)
      {

         // Set the title format based on the value selected from the
         // DropDownList control. The SelectedIndex property can be used
         // to determine an enumeration value. Simply cast the value to 
         // the appropriate enumeration type. Note that the value might
         // need to be adjusted if the enumeration type is not zero-based. 
         Calendar1.TitleFormat = (TitleFormat)ModeList.SelectedIndex;

      }

   </script>

<head runat="server">
    <title> DropDownList SelectedIndex Example </title>
</head>
<body>

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

      <h3> DropDownList SelectedIndex Example </h3>

      Choose the title format.

      <br /><br /> 

      <asp:Calendar id="Calendar1"
           ShowGridLines="True" 
           ShowTitle="True"
           runat="server"/>

      <br /><br />

      <table cellpadding="5">

         <tr>

            <td>

               Format:

            </td>

         </tr>

         <tr>

            <td>

               <asp:DropDownList id="ModeList"
                    AutoPostBack="True"
                    OnSelectedIndexChanged="Selection_Change"
                    runat="server">

                  <asp:ListItem> Month </asp:ListItem>
                  <asp:ListItem Selected="True"> MonthYear </asp:ListItem>

               </asp:DropDownList>

            </td>

         </tr>

      </table>   

   </form>

</body>
</html>
 


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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