Images are Not View in IE8,IE9 Browser

Hi,Sir

Now I had attached some images in email body for better apperance , the issue is images in email are shown in ie6 ,ie7 , mozilla ,chrome

        StringBuilder sb = new StringBuilder();

        string Img1 = "";
        string Img2 = "";

        sb.Append("");
        sb.Append("

        MailMessage mail = new MailMessage();

        mail.From = new MailAddress(txtUsername.Text);

        mail.To.Add(txtTo.Text);

        mail.Subject = txtSubject.Text;

        mail.Priority=MailPriority.High;

        string mailbody = txtBody.Text;

       AlternateView htmlView = AlternateView.CreateAlternateViewFromString(strString,null, "text/html");

       LinkedResource log = new LinkedResource("D:\\EmailFormat\\Image\\delivered.png");    
       log.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;
       log.ContentId = "companylogo";
       htmlView.LinkedResources.Add(log);
       mail.AlternateViews.Add(htmlView);

       LinkedResource log1 = new LinkedResource("D:\\EmailFormat\\Image\\notdelivered.png");
       log1.ContentId = "companylogo1";
       htmlView.LinkedResources.Add(log1);
       mail.AlternateViews.Add(htmlView);

      mail.IsBodyHtml = true;

      SmtpClient smtp = new SmtpClient();

      smtp.EnableSsl = true;

      smtp.Host = "smtp.gmail.com";
     
      smtp.Port = 587;

      smtp.Credentials = new System.Net.NetworkCredential(txtUsername.Text, txtpwd.Text);

      smtp.Send(mail);