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DataListItem.ItemIndex Property

Gets the index of the DataListItem object from the Items collection of the control.

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

public virtual int ItemIndex { get; }
/** @property */
public int get_ItemIndex ()

public function get ItemIndex () : int

Property Value

The index of the DataListItem object from the Items collection.

Use the ItemIndex property to determine the index number of the DataListItem object from the Items collection.

NoteNote

This property only applies to data items in the DataList control. The ItemType property of the DataListItem object must be set to ListItemType.Item, ListItemType.AlternatingItem, ListItemType.SelectedItem, or ListItemType.EditItem.

The following example demonstrates how to use the ItemIndex property to display the index number of the DataListItem object from the Items collection of the control.

NoteNote

The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, seeASP.NET Web Page Code Model.

<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
<html>
   <script language = "C#" runat="server">
 
      ICollection CreateDataSource() 
      {
         DataTable dt = new DataTable();
         DataRow dr;
 
         dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
  
         for (int i = 0; i < 10; i++) 
         {
            dr = dt.NewRow();
            dr[0] = "Item " + i.ToString();
            dt.Rows.Add(dr);
         }
 
         DataView dv = new DataView(dt);
         return dv;
      }
 
      void Page_Load(Object sender, EventArgs e) 
      {
         if (!IsPostBack) 
         {
            DataList1.DataSource = CreateDataSource();
            DataList1.DataBind();
         }
      }
 
      void Button_Click(Object sender, EventArgs e)
      {

         Label1.Text = "The ItemIndex of each item in the DataList are: <br>"; 
 
         foreach (DataListItem item in DataList1.Items)
         { 
            Label1.Text += "<br>" + item.ItemIndex.ToString() + " - " +
                           ((DataBoundLiteralControl)item.Controls[1]).Text;
         }

      }
  
 
   </script>
 
<body>
 
   <form runat=server>

      <h3>DataListItem ItemIndex Example</h3>
 
      <asp:DataList id="DataList1" runat="server"
           BorderColor="black"
           CellPadding="3"
           Font-Name="Verdana"
           Font-Size="8pt">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <HeaderTemplate>

            Items

         </HeaderTemplate>
               
         <ItemTemplate>

            <%# DataBinder.Eval(Container.DataItem, "StringValue") %>

         </ItemTemplate>
 
      </asp:DataList>

        <br><br>

      <asp:Button id="Button1"
           Text="Display ItemIndex for Items in the DataList"
           OnClick="Button_Click"
           runat="server"/>
 
      <br><br>

      <asp:Label id="Label1"
           runat="server"/>
 
   </form>
 
</body>
</html>


Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

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