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CustomValidator.AddAttributesToRender Method

This method supports the .NET Framework infrastructure and is not intended to be used directly from your code.

Adds the properties of the CustomValidator control to the output stream for rendering on the client.

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

protected override void AddAttributesToRender (
	HtmlTextWriter writer
)
protected void AddAttributesToRender (
	HtmlTextWriter writer
)
protected override function AddAttributesToRender (
	writer : HtmlTextWriter
)

Parameters

writer

A System.Web.UI.HtmlTextWriter that contains the output stream for rendering on the client.

The following code example demonstrates how to override the AddAttributesToRender method in a custom server control so that the CustomValidator error message always appears in bold.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>
<HTML>
  <HEAD>
    <title>Custom CustomValidator - AddAttributesToRender - C# Example</title>
    <script runat="server">
    void CustomValidator1_ServerValidate(Object source, ServerValidateEventArgs args) 
    {
      try 
      {
        // Test whether the value entered into the text box is even.
        int i = int.Parse(args.Value);
        args.IsValid = ((i%2) == 0);
      }
      catch(Exception ex)
      {
        args.IsValid = false;
      }
    }
    </script>
  </HEAD>
<body>
  <form id="Form1" method="post" runat="server">
    <h3>Custom CustomValidator - AddAttributesToRender - C# Example</h3>
    
    <asp:Label id="Label1" runat="server" Text="Enter an even number:" /><BR>
    
    <asp:TextBox id="TextBox1" runat="server" />&nbsp;
    
    <aspSample:CustomCustomValidatorAddAttributesToRender 
      id="Customvalidator1" 
      runat="server" 
      ControlToValidate="TextBox1" 
      Display="Static" 
      ErrorMessage="Not an even number!" 
      OnServerValidate="CustomValidator1_ServerValidate" /><br><br>
    
    <asp:Button id="Button1" runat="server" Text="Validate" />
    
  </form>
</body>
</HTML>
...using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomCustomValidatorAddAttributesToRender : System.Web.UI.WebControls.CustomValidator
    {
        protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
        {
        // Show the CompareValidator's error message as bold.
        writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold");
          
        // Call the Base's AddAttributesToRender method.
        base.AddAttributesToRender(writer);
        }
    }
}

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<HTML>
  <HEAD>
    <title>Custom CustomValidator - AddAttributesToRender - VJ# Example</title>
    <script runat="server">
    void CustomValidator1_ServerValidate(Object source, 
        ServerValidateEventArgs args)
    {
        try {
            // Test whether the value entered into the text box is even.
            int i = Int32.Parse(args.get_Value());
            args.set_IsValid((i%2) == 0);
        }
        catch(Exception ex) {
            args.set_IsValid(false);
        }
    } //CustomValidator1_ServerValidate
    </script>
  </HEAD>
<body>
  <form id="Form1" method="post" runat="server">
    <h3>Custom CustomValidator - AddAttributesToRender - VJ# Example</h3>
    
    <asp:Label id="Label1" runat="server" Text="Enter an even number:" /><BR>
    
    <asp:TextBox id="TextBox1" runat="server" />&nbsp;
    
    <aspSample:CustomCustomValidatorAddAttributesToRender 
      id="Customvalidator1" 
      runat="server" 
      ControlToValidate="TextBox1" 
      Display="Static" 
      ErrorMessage="Not an even number!" 
      OnServerValidate="CustomValidator1_ServerValidate" /><br><br>
    
    <asp:Button id="Button1" runat="server" Text="Validate" />
    
  </form>
</body>
</HTML>
...package Samples.AspNet;

public class CustomCustomValidatorAddAttributesToRender
     extends System.Web.UI.WebControls.CustomValidator
{
    protected void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
    {
        // Show the CompareValidator's error message as bold.
        writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, 
            "bold");
        // Call the Base's AddAttributesToRender method.
        super.AddAttributesToRender(writer);
    } //AddAttributesToRender
} //CustomCustomValidatorAddAttributesToRender

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

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