html AlternateView not working with MailDefinition and embedded objects in c#

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embedded

C#

Windows

HTML

email

If I send emails using a MailDefinition object and use html Alternateview without embedded objects , everything works fine. But as soon as I add embedded objects I get a blank email. I need to send embedded images with the alternate html view. I've been struggling with this problem for days and would appreciate it if somebody can suggest a solution.

The sample code is given below. If I comment the line "md.EmbeddedObjects.Add(emo);" the email works fine.

protected void sendEMail_Click(object sender, System.EventArgs e)
    {
        MailMessage msg = CreateMessage();
            SmtpClient sc = new SmtpClient();
            sc.Send(msg);
    }


public MailMessage CreateMessage()
    {
        MailDefinition md = new MailDefinition();
        md.BodyFileName = "htmltemplate.htm";
        md.From = sourceFrom.Text;
        md.Subject = sourceSubject.Text;
        md.IsBodyHtml = true;
ListDictionary replacements = new ListDictionary();
        replacements.Add("<%To%>", sourceTo.Text
        replacements.Add("<%From%>", md.From);
            EmbeddedMailObject emo = new EmbeddedMailObject();
            emo.Path = "image1.png";//have tried Server.Mappath("~/image1.png")
            emo.Name = "hdr";
md.EmbeddedObjects.Add(emo);// With this line I get a blank email. If the line is removed the email works fine.
MailMessage fileMsg;
         
            fileMsg = md.CreateMailMessage(sourceTo.Text, replacements, this);
AlternateView htmlView = AlternateView.CreateAlternateViewFromString(fileMsg.Body, null, "text/html");
fileMsg.AlternateViews.Add(htmlView);
return fileMsg;
        }