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HtmlTextArea Class

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

For a list of all members of this type, see HtmlTextArea Members.

System.Object
   System.Web.UI.Control
      System.Web.UI.HtmlControls.HtmlControl
         System.Web.UI.HtmlControls.HtmlContainerControl
            System.Web.UI.HtmlControls.HtmlTextArea

[Visual Basic]
Public Class HtmlTextArea
   Inherits HtmlContainerControl
   Implements IPostBackDataHandler
[C#]
public class HtmlTextArea : HtmlContainerControl,
   IPostBackDataHandler
[C++]
public __gc class HtmlTextArea : public HtmlContainerControl,
   IPostBackDataHandler
[JScript]
public class HtmlTextArea extends HtmlContainerControl implements
   IPostBackDataHandler

Thread Safety

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

Remarks

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.

Note   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   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 Controls.

Example

[Visual Basic, C#] The following example demonstrates how to use the HtmlTextArea control to create a multiline text box.

[Visual Basic] 
<%@ Page Language="VB" AutoEventWireup="True" %>

<html>
<head>

   <script runat="server">

      Sub SubmitBtn_Click(sender As Object, e As EventArgs) 
      
         Span1.InnerHtml = "You wrote: <br>" + TextArea1.Value
      
      End Sub

   </script>

</head>
<body>

   <form runat=server>

      <h3>HtmlTextArea Example</h3>

      Enter your comments: <br>

      <textarea id="TextArea1" 
                runat="server"/>

      <br>

      <input type="submit"  
             value="Submit" 
             OnServerClick="SubmitBtn_Click" 
             runat="server"/>

      <p>

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

   </form>

</body>
</html>

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

<html>
<head>

   <script runat="server">

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

   </script>

</head>
<body>

   <form runat=server>

      <h3>HtmlTextArea Example</h3>

      Enter your comments: <br>

      <textarea id="TextArea1" 
                runat="server"/>

      <br>

      <input type="submit"  
             value="Submit" 
             OnServerClick="SubmitBtn_Click" 
             runat="server"/>

      <p>

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

   </form>

</body>
</html>

[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Web.UI.HtmlControls

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

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

See Also

HtmlTextArea Members | System.Web.UI.HtmlControls Namespace | Rows | Cols | Value | Name | ServerChange | HtmlInputText

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