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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; }
/** @property */
public int get_SelectedIndex ()

/** @property */
public void set_SelectedIndex (int value)

public override function get SelectedIndex () : int

public override function set SelectedIndex (value : int)

Not applicable.

Property Value

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.


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"
<html xmlns="" >
   <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;

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

   <form id="form1" runat="server">
      <h3> DropDownList SelectedIndex Example </h3>

      Choose the title format.

      <br /><br /> 
      <asp:Calendar id="Calendar1"

      <br /><br />

      <table cellpadding="5">








               <asp:DropDownList id="ModeList"

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





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, 1.1, 1.0