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DataKey.Item Property (String)

Gets the value of the key field with the specified field name from a DataKey object.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)
public virtual Object this[
	string name
] { get; }


Type: System.String

The name of the key field for which to retrieve the key field value.

Property Value

Type: System.Object
The value of the key field with the specified field name.

Use the Item[String] property to retrieve the value of the specified key field from the DataKey object.


As an alternative, you can also use the Item[Int32] property to retrieve a key field value by index.

The following code example demonstrates how to use the Item[String] property to retrieve a key field value from a specific index in a DataKey object.

<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<script runat="server">

  void CustomerDetailsView_DataBound(Object sender, EventArgs e)

    // Get the value of the PostalCode key field.
    String value = CustomerDetailsView.DataKey["PostalCode"].ToString();

    // Display the the value of the key field.
    MessageLabel.Text = "The value of the PostalCode key field is " + value +



<html xmlns="http://www.w3.org/1999/xhtml" >

  <head runat="server">
    <title>DataKey Example</title>
    <form id="Form1" runat="server">

      <h3>DataKey Example</h3>

        <asp:detailsview id="CustomerDetailsView"
          datakeynames="CustomerID, CompanyName, PostalCode"  



        <asp:label id="MessageLabel"

        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the Web.config file.                            -->
        <asp:sqldatasource id="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
          connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 


.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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