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HtmlControl.Attributes Property

Gets a collection of all attribute name and value pairs expressed on a server control tag within the ASP.NET page.

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

public AttributeCollection Attributes { get; }

Property Value

Type: System.Web.UI.AttributeCollection
A System.Web.UI.AttributeCollection object that contains all attribute name and value pairs expressed on a server control tag within the Web page.

Use this property to programmatically access the attributes of the HTML server control. All HTML server controls store their attributes in the Control.ViewState property.

HTML attributes are treated by the .NET Framework as properties on the HTML server control to which they belong.

For additional information on the attributes collection, see the System.Web.UI.AttributeCollection class.

The following code example demonstrates how to use the Attributes property to determine the attributes of the HtmlSelect control.

<%@ Page Language="C#" AutoEventWireup="True" %>

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

<script language="C#" runat="server">
   void Page_Load(Object sender, EventArgs e) 
      Message.InnerHtml = "<h4>The select box's attributes collection contains:</h4>";

      IEnumerator keys = Select.Attributes.Keys.GetEnumerator();

      while (keys.MoveNext()) 

         String key = (String)keys.Current;
         Message.InnerHtml += key + "=" + Select.Attributes[key] + "<br />";



<head runat="server">
    <title>The select box's attributes collection contains:</title>
<form id="Form1" runat="server">

   <h3>HtmlControl Attribute Collection Example</h3>

   Make a selection:

   <select id="Select" 
           style="font: 12pt verdana;

      <option>Item 1</option>
      <option>Item 2</option>
      <option>Item 3</option>


   <br />

   <span id="Message" enableviewstate="false" runat="server" />


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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