How to create HTML email with embedded images from RTF and send it using Outlook in .NET C#

           using System;

using System.IO;
using System.Collections;
using Outlook = Microsoft.Office.Interop.Outlook;

namespace RtfToHtmlEmail
{
    class Program
    {
        static void Main(string[] args)
        {
            // This application converts RTF file to HTML email with embedded images
            // and send the email using Outlook

            // Here we'll specify settings variables
            string pathToRtf = @"c:\Book.rtf";
            // We need this folder to store image attachments temporary.
            // Images will be deleted after sending the email.
            string pathToStoreTempAttachments = @"c:\temp";
            string from = "bob@bobsite.com";
            string to = "john@johnsite.com";
            string subject = "Testing message from Bob to John using Outlook";

            // 1. Convert RTF to HTML and place all images to list
            string rtf = File.ReadAllText(pathToRtf);
            SautinSoft.RtfToHtml r = new SautinSoft.RtfToHtml();
            r.ImageStyle.IncludeImageInHtml = false;
            ArrayList imageList = new ArrayList();

            // 2. After launching this method we'll get our RTF document in HTML format
            // and list of all images.
            string html = r.ConvertString(rtf, imageList);

            // 3. Create an instance of MS Outlook
            //Type outlookApp = Type.GetTypeFromProgID("Outlook.Application");
            //object objOutlookApp = Activator.CreateInstance(outlookApp);
            Outlook.Application application = new Outlook.Application();

            // 4. Create a new MailItem and set the To, Subject, and Body properties.
            Outlook.MailItem newMail = (Outlook.MailItem)application.CreateItem(Outlook.OlItemType.olMailItem);
            newMail.To = to;
            newMail.Subject = subject;
            newMail.HTMLBody = html;
            newMail.BodyFormat = Outlook.OlBodyFormat.olFormatHTML;

            // 5. Retrieve the account that has the specific SMTP address.
            // Use this account to send the e-mail.
            Outlook.Account account = GetAccountForEmailAddress(application, from);

            // 6. Attach images to the email using cid
            // And send the email
            foreach (SautinSoft.RtfToHtml.SautinImage si in imageList)
            {
                string imageCid = si.Cid.Replace("cid:", "");
                string pathToImage = Path.Combine(pathToStoreTempAttachments, imageCid);
                si.Img.Save(Path.Combine(pathToImage));
                Outlook.Attachment attachment = newMail.Attachments.Add(pathToImage, Outlook.OlAttachmentType.olEmbeddeditem, null, imageCid);
                attachment.PropertyAccessor.SetProperty("http://schemas.microsoft.com/mapi/proptag/0x3712001E", imageCid);
                File.Delete(pathToImage);
            }

            newMail.SendUsingAccount = account;
            newMail.Send();
        }
        public static Outlook.Account GetAccountForEmailAddress(Outlook.Application application, string smtpAddress)
        {

            // Loop over the Accounts collection of the current Outlook session.
            Outlook.Accounts accounts = application.Session.Accounts;
            foreach (Outlook.Account account in accounts)
            {
                // When the e-mail address matches, return the account.
                if (account.SmtpAddress == smtpAddress)
                {
                    return account;
                }
            }
            throw new System.Exception(string.Format("No Account with SmtpAddress: {0} exists!", smtpAddress));
        }

    }
}