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HtmlTextArea.RenderAttributes Method

Renders the HtmlTextArea control's attributes to the specified HtmlTextWriter object.

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

protected override void RenderAttributes(
	HtmlTextWriter writer
)

Parameters

writer
Type: System.Web.UI.HtmlTextWriter

The HtmlTextWriter that receives the rendered content.

The RenderAttributes method renders the name attribute of the HtmlTextArea control directly to ensure that it has the same value as the Control.UniqueID property. After rendering the attribute, the RenderAttributes method calls the base class's RenderAttributes method.

The RenderAttributes method is used primarily by control developers extending the functionality of the HtmlTextArea control.

The following code example demonstrates how to override the RenderAttributes method in a custom server control so that specific title text is always displayed for the HtmlTextArea control.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void Page_Load(Object sender, EventArgs e)
  {
    HtmlTextArea1.Value = "Hello HTML Text Area World.";
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom HtmlTextArea RenderAttributes Example</title>
  </head>

  <body>
    <form id="Form1" 
          method="post" 
          runat="server">

      <h3>Custom HtmlTextArea - RenderAttributes - C# Example</h3>

      <aspSample:CustomHtmlTextAreaRenderAttributes 
        id="HtmlTextArea1" 
        name="HtmlTextArea1" 
        runat="server" 
        rows="4" 
        cols="50" />

    </form>
  </body>
</html>
using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomHtmlTextAreaRenderAttributes : System.Web.UI.HtmlControls.HtmlTextArea
    {
        protected override void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
        {
            // Write out the Title attribute.
            writer.Write(" Title=\"Text from RenderAttributes.\"");

            // Call the base class's RenderAttributes method. 
            base.RenderAttributes(writer);
        }
    }
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

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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