Email Not Coming yahooand out look

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ASP.NET

hi i am trying to send mail from asp.net by embedding images its coming fine in gmail account but in yahoo and out look its not coming i am receving the mail but no content inside the mAIL


if i dont write this line



AlternateView avImages = AlternateView.CreateAlternateViewFromString(html, null, MediaTypeNames.Text.Html);

mail.AlternateViews.Add(htmlView);//body of the mail

resources.ForEach(x => avImages.LinkedResources.Add(x));//add all the linked resources in alternative View

mail.AlternateViews.Add(avImages);// Add the views for image

and simply add
mail.body = EmailContent;
then the mail comes in the yahoo ,outlook and gmail

 System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
                       SmtpClient smtp = new SmtpClient();
                   //do the attachemts to the mail
                   if (fup1.HasFile)
                   {
                       mail.Attachments.Add(new Attachment(fup1.PostedFile.InputStream, fup1.FileName));
                   }
        mail.To.Add(new MailAddress(ds.Tables[0].Rows[i]["Email"].ToString()));//recipent aaddress

                   mail.From = new MailAddress(ddlpromoemail.SelectedItem.Text.ToString().Trim());
                   mail.Subject = txtsubjectline.Text;
                   mail.IsBodyHtml = true;
                   string docid = ds.Tables[0].Rows[i]["EmployeeCode"].ToString();

                   ViewState["storeContent"] = EmailContent;

                   Regex reg = new Regex(@"s]+))?)+\s*|\s*)/?>");

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

                   List<LinkedResource> resources = new List<LinkedResource>();//using this to collect all the resourcess file


                   foreach (Match match in reg.Matches(EmailContent))//loop through all the image tag within the content and gget the image tag from thee
                   {

                       //pass the one by one image tag this function will convert the base 64 string into image file and  ssave it int images folder
                       //and give u the



                       string path = SaveImage(match.Value,ref err);//get the image path  save the base 64 string image file in folder


                       // Create the image resource from image path using LinkedResource class..

                           LinkedResource LinkedImage = new LinkedResource(@path);
                           //get the height
                           string height = Regex.Match(match.Value, "<img.+?height=[\"'](.+?)[\"'].+?>", RegexOptions.IgnoreCase).Groups[1].Value;
                           //get the width
                           string width = Regex.Match(match.Value, "<img.+?width=[\"'](.+?)[\"'].+?>", RegexOptions.IgnoreCase).Groups[1].Value;
                           LinkedImage.ContentType = new ContentType(MediaTypeNames.Image.Jpeg);
                           LinkedImage.ContentId = imgn + "MyPic";
                           string imgtag = "<img height='" + height + "'  width='" + width + "' src=cid:" + imgn + "MyPic" + " />";
                           EmailContent = EmailContent.Replace(match.Value, imgtag);
                           resources.Add(LinkedImage);//add all the linked resources
                           imgn++;//imgn will be used to give unique name to each contentid
                   }
                   //add image a bug
                   //append the emil adress to image tag
                   IFormatProvider provider = new System.Globalization.CultureInfo("en-CA", true);

                   CultureInfo ci = new CultureInfo("en-GB");
                   Thread.CurrentThread.CurrentCulture = ci;
                  // string fdg = "<img src='http://www.yoursite.com/beacon.aspx?emailId=xxx";

                   string url ="http://localhost:54645/View/MarketingEngine/beacon.aspx?email=" + ds.Tables[0].Rows[i]["Email"].ToString() + "&empcode=" + ds.Tables[0].Rows[i]["EmployeeCode"].ToString() + "&template=" + txtpromoemailname.Text + "&Dateins=" + DateTime.Now.ToString("dd-MMM-yyyy", ci);
                   string bgimg = "<img height="2" width="2">.*?)(""|').*?>(?<value>.*?)");

                   foreach (Match match in r.Matches(EmailContent))
                   {
                       string href = match.Groups["href"].Value.ToString().Trim();
                       string link_url = "http://localhost:54645/View/MarketingEngine/LinksClicked.aspx?email=" + ds.Tables[0].Rows[i]["Email"].ToString() + "&address=" + href + "&empcode=" + ds.Tables[0].Rows[i]["EmployeeCode"].ToString() + "&template=" + txtpromoemailname.Text + "&Dateins=" + DateTime.Now.ToString("dd-MMM-yyyy", ci);
                       EmailContent = EmailContent.Replace(href, link_url);
                   }
//end region

                   string html = "<!DOCTYPE html><html><body>" + EmailContent +"</body></html>";
                   AlternateView avImages = AlternateView.CreateAlternateViewFromString(html, null, MediaTypeNames.Text.Html);

                   mail.AlternateViews.Add(htmlView);//body of the mail

                   resources.ForEach(x => avImages.LinkedResources.Add(x));//add all the  linked resources in alternative View

                   mail.AlternateViews.Add(avImages);// Add the views for image 

                   smtp.Host = host;

                   smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                   smtp.Credentials = new System.Net.NetworkCredential(ddlpromoemail.SelectedItem.Text.ToString().Trim(),password);

                   //Or your Smtp Email ID and Password
                   smtp.EnableSsl = true;

                   //To request a read receipt, we need add a custom header named 'Disposition-Notification-To'
                   //in this , read receipts will go back to 'ddlBounceEmailid.SelectedItem.Text.ToString().Trim()'
                   //it's important to note that read receipts will only be sent by those mail clients that
                   //a) support them
                   //and
                   //b)have them enabled.
                   mail.Headers.Add("Disposition-Notification-To", "<" + ddlBounceEmailid.SelectedItem.Text.ToString().Trim() + ">");

                       mail.BodyEncoding = System.Text.Encoding.UTF8;
                       mail.SubjectEncoding = System.Text.Encoding.UTF8;


                           smtp.Send(mail);