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EmbeddedMailObject Class

Note: This class is new in the .NET Framework version 2.0.

Represents an item to embed in an e-mail message constructed using the MailDefinition class.

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

Public NotInheritable Class EmbeddedMailObject
Dim instance As EmbeddedMailObject

public final class EmbeddedMailObject
public final class EmbeddedMailObject

The EmbeddedMailObject represents an item to embed in a mail message. These embedded items can be image files such as company logos. Each embedded item is specified by an identifier and a path.

To ensure that an embedded object is displayed correctly within the e-mail message file, the following conditions must be met:

  • The mail message is in HTML format.

  • The item is an image file (.jpg, .gif, .bmp, and so on).

  • The HTML-formatted body file specified in the BodyFileName property contains a reference to the image file using the following syntax:

    <img src="cid:identifier" alt="Alternate Text" />.

If an EmbeddedMailObject is added to a mail message and does not fulfill all of the requirements specified previously, it will most likely be displayed as an attachment in the mail message. If an item is referenced by an identifier in the mail message but not included as an embedded item, it will appear as a broken attachment when the mail is viewed.

The EmbeddedMailObjectsCollection stores a collection of EmbeddedMailObject objects for a single mail message. The EmbeddedMailObjectsCollection is used by the EmbeddedObjects property of the MailDefinition object to create the mail message.

Mail messages that allow embedded objects are configurable in the following Web controls by setting their MailDefinition properties declaratively:


The values in the EmbeddedMailObject and EmbeddedMailObjectsCollection objects are not stored in view state. This protects against malicious users discovering path information for your server.

The following code example demonstrates an ASP.NET page that uses a ChangePassword Web control, and includes an event handler for the SendingMail event named SendingMail. The code example assumes that the ASP.NET Web site has been configured to use ASP.NET membership and Forms authentication, and that a user has been created whose name and password are known to you. For more information, see How to: Implement Simple Forms Authentication.

If the password change succeeds, the code in the SendingMail event handler attempts to send an e-mail message to the user to confirm the change. SMTP must already be configured on the server in order for this code example to work. For information about how to configure an SMTP server, see How to: Install and Configure SMTP Virtual Servers in IIS. For the purposes of this example, it is not necessary to configure an SMTP server; the example is constructed to test for a failure to send an e-mail message.

If a mail server is not configured correctly or some other error occurs and the e-mail message cannot be sent, the SendMailError function is called. A message is displayed to the user. In addition, an event is logged to the Windows Application event log with the assumption that an event source named MySamplesSite already exists. See the code example below to create the specified event source. For more information about creating an event source, see Server Event Handling in ASP.NET Web Pages. The Handled property of the SendMailErrorEventArgs object is set to true to indicate that the error has been handled.

<%@ Page Language="VB" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<script runat="server">

  Public Sub MySendingMail(ByVal Sender As Object, ByVal e As MailMessageEventArgs)
    Message1.Text = "Sent mail to you to confirm the password change."
  End Sub

  Public Sub MySendMailError(ByVal Sender As Object, ByVal e As SendMailErrorEventArgs)
    Message1.Text = "Could not send mail to confirm the password change."
    ' The MySamplesSite event source has already been created by an administrator.
    Dim myLog As System.Diagnostics.EventLog
    myLog = new System.Diagnostics.EventLog
    myLog.Log = "Application"
    myLog.Source = "MySamplesSite"
    myLog.WriteEntry("Sending mail via SMTP failed with the following error: " & e.Exception.Message.ToString(), System.Diagnostics.EventLogEntryType.Error)

    e.Handled = True
  End Sub


<html xmlns="" >
<head runat="server">
  <title>ChangePassword including a SendMailError Event</title>
  <form id="form1" runat="server">
  <div align="center">

    <asp:LoginView ID="LoginView1" Runat="server" 
        <asp:LoginName ID="LoginName1" Runat="server" FormatString="You are logged in as {0}." />
        <BR />
        You are not logged in
    </asp:LoginView><br />
    <asp:ChangePassword ID="ChangePassword1" Runat="server"
      ContinueDestinationPageUrl="~/Default.aspx" >
        Subject="Activity information for you">
          <asp:EmbeddedMailObject Name="LoginGif" Path="~\MailFiles\Login.gif" />
          <asp:EmbeddedMailObject Name="PrivacyNoticeTxt" Path="~\MailFiles\PrivacyNotice.txt" />
    </asp:ChangePassword><br />
    <asp:Label ID="Message1" Runat="server" ForeColor="Red" /><br />

    <asp:HyperLink ID="HyperLink1" Runat="server" 

Use the following code example if you need to programmatically add the event source named MySamplesSite to your Application log. This event source must exist in order for the first code example to work correctly. The following code example requires Administrator privileges.

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Diagnostics

Namespace CreateEventSource
  Class Program
    Sub Main()

            ' Create the source, if it does not already exist.
            If Not (EventLog.SourceExists("MySamplesSite")) Then
                EventLog.CreateEventSource("MySamplesSite", "Application")
                Console.WriteLine("Creating Event Source")
            End If

            ' Create an EventLog instance and assign its source.
            Dim myLog As New EventLog
            myLog.Source = "MySamplesSite"

            ' Write an informational entry to the event log.
            myLog.WriteEntry("Testing writing to event log.")

            Console.WriteLine("Message written to event log.")
        Catch e As Exception
        End Try

    End Sub
  End Class
End Namespace

The following example code can be used as the ChangePasswordMail.htm file for the preceding example code.

Security noteSecurity Note

Sending user account names or passwords in e-mail is a potential security threat. E-mail messages are typically sent in plain text and can be read by special network "sniffing" applications. To improve security, use the mitigations that are described in Securing Login Controls.


  <h1>Your password for the account named &quot;<%Username%>&quot; has changed.</h1>

  If you did not initiate this change, please call 1-206-555-0100.
  <a href="">
    <img src="cid:LoginGif" alt="Log In" />
  Please read our attached Privacy Notice.


  • AspNetHostingPermission  for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.


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

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