Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All

ImageButton.AddAttributesToRender Method

Adds the attributes of an ImageButton 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


Type: System.Web.UI.HtmlTextWriter

The output stream to render on the client.

The OnPreRender method is used primarily by control developers when deriving a custom class from the ImageButton control.

The following code example demonstrates how to override the AddAttributesToRender method in a custom server control so that the ImageButton text always appears with a thin border.


The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. The first part of this code sample must be copied into an empty text file that has an .aspx extension. The second part must be saved as a code file (either .cs for C# or .vb for Visual Basic). For more information on the Web Forms code model, see ASP.NET Web Forms Page Code Model.

<%@ 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 ImageButton - AddAttributesToRender - C# Example</title>
    <script runat="server">
      void ImageButton1_Command(Object sender, CommandEventArgs e) 
        // Redirect to the Microsoft home page.
        <form id="Form1" method="post" runat="server">
            <h3>Custom ImageButton - AddAttributesToRender - C# Example</h3>

            <aspSample:CustomImageButtonAddAttributesToRender id="ImageButton1" runat="server" 
             OnCommand="ImageButton1_Command" AlternateText="Microsoft Home" 
             ImageUrl="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif" />



using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomImageButtonAddAttributesToRender : System.Web.UI.WebControls.ImageButton
        protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
            // Show the ImageButton with a thin border.

            // Call the Base's AddAttributesToRender method. 

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
© 2015 Microsoft