This documentation is archived and is not being maintained.

HtmlTextArea Class

Allows programmatic access to the <textarea> HTML element on the server.

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

[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class HtmlTextArea : HtmlContainerControl, 
<asp:HtmlTextArea />

The HtmlTextArea control corresponds to the <textarea> HTML element that allows you to create a multiline text box on a Web page. Use this control to programmatically manipulate a <textarea> HTML element.

This class allows you to control the height and width of a multiline text box by setting the Rows and Cols properties, respectively. You also can assign a name to the control by setting the Name property. To determine or specify the text in the text box, use the Value property.

The HtmlTextArea class provides a ServerChange event that allows you to perform a custom set of instructions every time the value of the text box changes between posts to the server. This event is commonly used for data validation.


If you want to create a single-line text box, use the HtmlInputText control.

For a list of initial property values for an instance of HtmlTextArea, see the HtmlTextArea constructor.

Caution noteCaution:

This control can be used to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. ASP.NET provides an input request validation feature to block script and HTML in user input. Validation server controls are also provided to assess user input. For more information, see Validation Server Control Syntax.

The following code example demonstrates how to use the HtmlTextArea control to create a multiline text box.

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

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

  void SubmitBtn_Click(Object sender, EventArgs e)
    Span1.InnerHtml = "You wrote: <br />" + TextArea1.Value;


<html xmlns="" >
   <title>HtmlTextArea Example</title>

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

      <h3>HtmlTextArea Example</h3>

      Enter your comments: <br />

      <textarea rows="2" cols="20" id="TextArea1" 

      <br />

      <input type="submit"  

      <br />

      <span id="Span1" 
            runat="server" />



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