RangeValidator.AddAttributesToRender Method (HtmlTextWriter)


This API supports the product infrastructure and is not intended to be used directly from your code.

Adds the HTML attributes and styles for the control that need to be rendered to the specified HtmlTextWriter object.

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

protected override void AddAttributesToRender(
	HtmlTextWriter writer


Type: System.Web.UI.HtmlTextWriter

An HtmlTextWriter that represents the output stream to render HTML content on the client.

The following code example demonstrates how to override the AddAttributesToRender method in a custom server control so that the RangeValidator text always displays as bold.

System_CAPS_security Security Note

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

<%@ 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"
<html xmlns="http://www.w3.org/1999/xhtml" >
    <title>Custom RangeValidator - AddAttributesToRender - C# Example</title>
    <script runat="server">
      void ButtonClick(Object sender, EventArgs e)
        if (Page.IsValid)
          Label1.Text="Page is valid.";
          Label1.Text="Page is not valid!!";
    <form id="Form1" method="post" runat="server">
      <h3>Custom RangeValidator - AddAttributesToRender - C# Example</h3>

      Enter a number from 1 to 10:<br />
      <asp:TextBox id="TextBox1" Runat="server" />

        Text="The value must be from 1 to 10!" />

      <br />
      <br />
      <asp:Button id="Button1" Text="Submit" OnClick="ButtonClick" runat="server" /><br />
      <br />

      <asp:Label id="Label1" runat="server" />
using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomRangeValidatorAddAttributesToRender : System.Web.UI.WebControls.RangeValidator
    protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
      // Show the Validation text as Bold 
      writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold");

      // Call the base AddAttributesToRender method.

.NET Framework
Available since 1.1
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