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DataBinder Class

Provides support for rapid application development (RAD) designers to generate and parse data-binding expression syntax. This class cannot be inherited.

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

[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class DataBinder

You can use the overloaded static Eval method of this class in data-binding syntax in an ASP.NET Web page. This provides an easier syntax to work with than standard data binding. However, because DataBinder.Eval provides automatic type conversion, it can result in slower performance.

For more information about ASP.NET data binding, expressions, and syntax, see Binding to Databases and Data-Binding Expressions Overview.

The following example uses the static GetPropertyValue method to populate the fields of a Repeater control using an ArrayList of Product objects. The Eval method could be applied with the same syntax, but it would not perform as quickly.

This example assumes the existence of a custom class which exposes a string Model property and a numeric UnitPrice property.

<%@ Page Language="C#" %>
<%@ Import Namespace="ASPSample" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<script runat="server">
protected void  Page_Load(object sender, EventArgs e)
        // Create and populate an ArrayList to store the products.
        ArrayList ProductList = new ArrayList();
        ProductList.Add(new Product("Standard", 99.95));
        ProductList.Add(new Product("Deluxe", 159.95));

        // Bind the array list to Repeater
        ListRepeater.DataSource = ProductList;

<html xmlns="">
	<title>DataBinder Example</title>
<form id="Form2" runat="server">
<asp:Repeater id="ListRepeater" runat="server">
		<th style="width:50; text-align:left">Model</th>
		<th style="width:100; text-align:right">Unit Price</th>
        <!-- Databind to the Product information using the DataBinder methods. 
             The Container.DataItem refers to the ArrayList object bound to 
             the ASP:Repeater in the Page Load event. -->
	        <%#DataBinder.GetPropertyValue(Container.DataItem, "Model")%>
	    <!-- Format the UnitPrice as currency. ({0:c}) -->
	    <td style="text-align:right">
	                     "UnitPrice", "{0:c}")%>

The following code is the custom Product class. This code should be included in a separate class file in the App_Code directory, such as Product.cs or Product.vb.

namespace ASPSample

    public class Product
        string _Model;
        double _UnitPrice;

        public Product(string Model, double UnitPrice)
            _Model = Model;
            _UnitPrice = UnitPrice;

        // The product Model. 
        public string Model
            get {return _Model;}
            set {_Model = value;}

        // The price of the each product. 
        public double UnitPrice
            get {return _UnitPrice;}
            set {_UnitPrice = value;}


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0