SelectedIndexChanged Event
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BaseDataList.SelectedIndexChanged Event

 

Occurs when a different item is selected in a data listing control between posts to the server.

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

public event EventHandler SelectedIndexChanged

The SelectedIndexChanged event is raised when a different item is selected in a data listing control between posts to the server.

For more information about handling events, see NIB: Consuming Events.

The following code example demonstrates how to provide an event handler for the SelectedIndexChanged event declaratively.


<%@ Page Language="C#" AutoEventWireup="True"%>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>

<!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" >

<head runat="server">
    <title>Declarative BaseDataList SelectedIndexChanged Example</title>
<script runat="server">

      ICollection CreateDataSource() 
      {

         // Create sample data for the DataGrid control.
         DataTable dt = new DataTable();
         DataRow dr;

         // Define the columns of the table.
         dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
         dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
         dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));

         // Populate the table with sample values.
         for (int i = 0; i < 9; i++) 
         {
            dr = dt.NewRow();

            dr[0] = i;
            dr[1] = "Item " + i.ToString();
            dr[2] = 1.23 * (i + 1);

            dt.Rows.Add(dr);
         }

         // Create a DataView from the DataTable.
         DataView dv = new DataView(dt);
         return dv;

      }

      void Page_Load(Object sender, EventArgs e) 
      {

         // Load sample data only once, when the page is first loaded.
         if (!IsPostBack) 
         {
            ItemsGrid.DataSource = CreateDataSource();
            ItemsGrid.DataBind();
         }

      }

      void IndexChange_Command(Object sender, EventArgs e)
      {

         // Display the details of the selected item.
         DetailsLabel.Text = 
            "Item Number: " + ItemsGrid.SelectedItem.Cells[1].Text + "<br />" +
            "Description: " + ItemsGrid.SelectedItem.Cells[2].Text + "<br />" +
            "Price: $" + ItemsGrid.SelectedItem.Cells[3].Text + "<br />";

      }

   </script>

</head>

<body>

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

      <h3>Declarative BaseDataList SelectedIndexChanged Example</h3>

      Select an item: 

      <br /><br />

      <asp:DataGrid id="ItemsGrid" 
           BorderColor="Black"
           ShowFooter="False" 
           CellPadding="3" 
           CellSpacing="0"
           HeaderStyle-BackColor="#aaaadd"
           OnSelectedIndexChanged="IndexChange_Command"
           runat="server">

         <Columns>

            <asp:ButtonColumn Text="Select"
                 CommandName="Select"/>

         </Columns>

      </asp:DataGrid>

      <hr />

      <table style="border-width:1; border-color:Black; margin:0">

         <tr style="background-color:#aaaadd">

            <td>

               Details

            </td>

         </tr>

         <tr>

            <td>

               <asp:Label id="DetailsLabel"
                    runat="server"
                    Text="No item selected."/>

            </td>

         </tr>

      </table>

   </form>

</body>
</html>

The following code example demonstrates how to provide an event handler for the SelectedIndexChanged event programmatically.


<%@ Page Language="C#" AutoEventWireup="True"%>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>

<!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" >

<head runat="server">
    <title>Programmatic BaseDataList SelectedIndexChanged Example</title>
<script runat="server">

      ICollection CreateDataSource() 
      {

         // Create sample data for the DataGrid control.
         DataTable dt = new DataTable();
         DataRow dr;

         // Define the columns of the table.
         dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
         dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
         dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));

         // Populate the table with sample values.
         for (int i = 0; i < 9; i++) 
         {
            dr = dt.NewRow();

            dr[0] = i;
            dr[1] = "Item " + i.ToString();
            dr[2] = 1.23 * (i + 1);

            dt.Rows.Add(dr);
         }

         // Create a DataView from the DataTable.
         DataView dv = new DataView(dt);
         return dv;

      }

      void IndexChange_Command(Object sender, EventArgs e)
      {

         // Display the details of the selected item.
         DetailsLabel.Text = "Item Number: " + ItemsGrid.SelectedItem.Cells[1].Text + "<br />" +
                              "Description: " + ItemsGrid.SelectedItem.Cells[2].Text + "<br />" +
                              "Price: $" + ItemsGrid.SelectedItem.Cells[3].Text + "<br />";

      }

      void Page_Load(Object sender, EventArgs e) 
      {         

         // Load sample data only once, when the page is first loaded.
         if (!IsPostBack) 
         {

            // Load sample data.
            ItemsGrid.DataSource = CreateDataSource();
            ItemsGrid.DataBind();

         }

         // Register event-handling methods.
         ItemsGrid.SelectedIndexChanged += new EventHandler(this.IndexChange_Command);

      }

   </script>

</head>

<body>

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

      <h3>Programmatic BaseDataList SelectedIndexChanged Example</h3>

      Select an item: 

      <br /><br />

      <asp:DataGrid id="ItemsGrid" 
           BorderColor="Black"
           ShowFooter="False" 
           CellPadding="3" 
           CellSpacing="0"
           HeaderStyle-BackColor="#aaaadd"
           runat="server">

         <Columns>

            <asp:ButtonColumn Text="Select"
                 CommandName="Select"/>

         </Columns>

      </asp:DataGrid>

      <hr />

      <table border="1" style="border-color:Black; margin:0">

         <tr style="background-color:#aaaadd">

            <td>

               Details

            </td>

         </tr>

         <tr>

            <td>

               <asp:Label id="DetailsLabel"
                    runat="server"
                    Text="No item selected."/>

            </td>

         </tr>

      </table>

   </form>

</body>
</html>

.NET Framework
Available since 1.1
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