ListControl.SelectedIndexChanged Event
.NET Framework (current version)
Occurs when the selection from the list control changes between posts to the server.
Assembly: System.Web (in System.Web.dll)
The SelectedIndexChanged event is raised when the selection from the list control changes between posts to the server.
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A list control must persist some values between posts to the server for this event to work correctly. Be sure that view state is enabled for the list control. |
For more information about handling events, see NIB: Consuming Events.
The following example demonstrates how to specify and code a handler for the SelectedIndexChanged event to display the selection made by the user.
<%@ Page Language="C#" AutoEventWireup="True" %> <%@ Import Namespace="System.Data" %> <!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 language="c#" runat="server"> ICollection CreateDataSource() { DataTable dt = new DataTable(); DataRow dr; dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32))); dt.Columns.Add(new DataColumn("StringValue", typeof(string))); dt.Columns.Add(new DataColumn("DateTimeValue", typeof(DateTime))); dt.Columns.Add(new DataColumn("BoolValue", typeof(bool))); dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double))); for (int i = 0; i < 9; i++) { dr = dt.NewRow(); dr[0] = i; dr[1] = "Item " + i.ToString(); dr[2] = DateTime.Now; dr[3] = (i % 2 != 0) ? true : false; dr[4] = 1.23 * (i+1); dt.Rows.Add(dr); } DataView dv = new DataView(dt); return dv; } void Page_Load(Object sender, EventArgs e) { if (!IsPostBack) { RadioButtonList1.DataSource = CreateDataSource(); RadioButtonList1.DataTextField="StringValue"; RadioButtonList1.DataValueField="CurrencyValue"; RadioButtonList1.DataBind(); } } void Index_Changed(Object sender, EventArgs e) { Label1.Text = "You selected " + RadioButtonList1.SelectedItem.Text + " with a value of $" + RadioButtonList1.SelectedItem.Value + "."; } </script> <head runat="server"> <title>ASP.NET Example</title> </head> <body> <form id="form1" runat="server"> <asp:RadioButtonList id="RadioButtonList1" OnSelectedIndexChanged="Index_Changed" AutoPostBack="true" runat="server"/> <br /> <asp:Label id="Label1" runat="server"/> </form> </body> </html>
.NET Framework
Available since 1.1
Available since 1.1
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