Gets or sets the index of the selected item in the DropDownList control.
[Visual Basic]
Overrides Public Property SelectedIndex As Integer
[C#]
public override int SelectedIndex {get; set;}
[C++]
public: __property int get_SelectedIndex();
public: __property void set_SelectedIndex(int);
[JScript]
public override function get SelectedIndex() : int;
public override function set SelectedIndex(int); 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.
Remarks
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 deselect every item in the list at the same time.
Note The indexes for the items in the DropDownList control are zero-based.
Example
[Visual Basic, C#] The following example demonstrates how to use the SelectedIndex property to determine the selected item in the DropDownList control.
[Visual Basic]
<%@ Page Language="VB" AutoEventWireup="True" %>
<html>
<script runat="server" >
Sub Selection_Change(sender As Object, e As EventArgs)
' 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 = CType(ModeList.SelectedIndex, TitleFormat)
End Sub
</script>
<body>
<form 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>
</form>
</body>
</html>
[C#]
<%@ Page Language="C#" AutoEventWireup="True" %>
<html>
<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>
<body>
<form 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>
</form>
</body>
</html>
[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button .gif)
in the upper-left corner of the page.
Requirements
Platforms: Windows 2000, Windows XP Professional, Windows Server 2003 family
See Also
DropDownList Class | DropDownList Members | System.Web.UI.WebControls Namespace | Items