Ever needed to convert html image link on your site to cid to embed on email

public ArrayList arr_image_path = new ArrayList();//image array (for embedding images)
public string _html, _plain;
public string RootDirectory = HttpRuntime.AppDomainAppPath.ToString();



public void covert_image_to_embedded_cid()
    {
        int cid = 0;


        string Pattern = @"url\(['|\""]+.*['|\""]\)|src=[""|'][^""']+[""|']";


        MatchCollection match_vars = Regex.Matches(_html, Pattern,
                                        RegexOptions.IgnoreCase);


        string img_path;


        foreach (Match match in match_vars)
        {


            _html = _html.Replace(match.Value, "src=\"cid:EmbedRes_" + cid + "\"");


            //get path;
            img_path = Regex.Replace(match.Value, @"url\(['|\""]", "");
            img_path = Regex.Replace(img_path, @"src=['|\""]", "");
            img_path = Regex.Replace(img_path, @"['|\""]\)", "").Replace("\"", "");



            arr_image_path.Add(img_path);
            cid++;
        }


    }


public bool sendmail(string strTo, string strSubject)
    {


        bool success = false;


        StringBuilder sb_plain = new StringBuilder();
        StringBuilder sb_html = new StringBuilder();


        //create the mail message
        MailMessage mail = new MailMessage();


        //set the addresses
        mail.From = new MailAddress(Mail_From);


        mail.To.Add(strTo);


        //set the content
        mail.Subject = strSubject;


        //Plain Text
        AlternateView plainView = AlternateView.CreateAlternateViewFromString(_plain, null, "text/plain");


        //Html part
        AlternateView htmlView = AlternateView.CreateAlternateViewFromString(_html, null, "text/html");
        mail.AlternateViews.Add(plainView);
        mail.AlternateViews.Add(htmlView);


        //add images
        if (arr_image_path.Count > 0)
        {
            for(int i=0; i<arr_image_path.Count; i++)
            {
                string img = arr_image_path[i].ToString();


                if (!img.ToLower().StartsWith("http"))
                {
                    img = RootDirectory + img;
                }
                LinkedResource logo = new LinkedResource(img);
                logo.ContentId = "EmbedRes_"+i;
                htmlView.LinkedResources.Add(logo);
            }
        }


 



        //send the message
        SmtpClient smtp = new SmtpClient(MailServer); //specify the mail server address


        //check if server creditial required


        if (credentialsRequired)
        {
            smtp.Credentials = new NetworkCredential(Mail_Username, Mail_Password);


        }


        //try
        {


            smtp.Send(mail);
        }
        //catch
        {


        }


 


        return success;
    }