C USES the MailAddress class to send the instance code for html formatted mail

1. First, the namespace using System.Net.Mail is introduced;
2. The function of the sent mail is encapsulated into one class, which contains the basic functions of the sent mail: recipient (more than one person), cc (more than one person), sender, subject, message body, attachment, etc. The encapsulated Email class is as follows:

public class Email
    {
        /// <summary>
        ///  The sender 
        /// </summary>
        public string mailFrom { get; set; }
        /// <summary>
        ///  The recipient 
        /// </summary>
        public string[] mailToArray { get; set; }
        /// <summary>
        ///  cc 
        /// </summary>
        public string[] mailCcArray { get; set; }
        /// <summary>
        ///  The title 
        /// </summary>
        public string mailSubject { get; set; }
        /// <summary>
        ///  The body of the 
        /// </summary>
        public string mailBody { get; set; }
        /// <summary>
        ///  Sender password 
        /// </summary>
        public string mailPwd { get; set; }
        /// <summary>
        /// SMTP Mail server 
        /// </summary>
        public string host { get; set; }
        /// <summary>
        ///  Whether the text is html format 
        /// </summary>
        public bool isbodyHtml { get; set; }
        /// <summary>
        ///  The attachment 
        /// </summary>
        public string[] attachmentsPath { get; set; }
        public bool Send()
        {
            // Class with the specified mail address MailAddress The instance 
            MailAddress maddr = new MailAddress(mailFrom);
            // Initialize the MailMessage The instance 
            MailMessage myMail = new MailMessage();

            // Add a mail address to the collection of recipient addresses 
            if (mailToArray != null)
            {
                for (int i = 0; i < mailToArray.Length; i++)
                {
                    myMail.To.Add(mailToArray[i].ToString());
                }
            }
            // Add a mail address to the cc recipient address collection 
            if (mailCcArray != null)
            {
                for (int i = 0; i < mailCcArray.Length; i++)
                {
                    myMail.CC.Add(mailCcArray[i].ToString());
                }
            }
            // Sender address 
            myMail.From = maddr;
            // The subject line of the email 
            myMail.Subject = mailSubject;
            // The encoding used for the subject content of the email 
            myMail.SubjectEncoding = Encoding.UTF8;
            // Email body 
            myMail.Body = mailBody;
            // The encoding of the email body 
            myMail.BodyEncoding = Encoding.Default;
            myMail.Priority = MailPriority.High;
            myMail.IsBodyHtml = isbodyHtml;
            // Add attachments where there are attachments 
            try
            {
                if (attachmentsPath != null && attachmentsPath.Length > 0)
                {
                    Attachment attachFile = null;
                    foreach (string path in attachmentsPath)
                    {
                        attachFile = new Attachment(path);
                        myMail.Attachments.Add(attachFile);
                    }
                }
            }
            catch (Exception err)
            {
                throw new Exception(" There was an error when adding an attachment :" + err);
            }
            SmtpClient smtp = new SmtpClient();
            // Specify the sender's email address and password to verify the sender's identity 
            smtp.Credentials = new System.Net.NetworkCredential(mailFrom, mailPwd);

            // Set up the SMTP Mail server 
            smtp.Host = host;
            try
            {
                // Send the email to SMTP Mail server 
                smtp.Send(myMail);
                return true;
            }
            catch (System.Net.Mail.SmtpException ex)
            {
                return false;
            }
        }
    }

3. The page calls the class that sent the email

protected void Send_Click(object sender, EventArgs e)
        {
            Email email = new Email();
            email.mailFrom = " The email address of the sender ";
            email.mailPwd = " The password of the sender's mailbox ";
            email.mailSubject = " Email subject ";
            email.mailBody = " Email content ";
            email.isbodyHtml = true;    // Whether it is HTML
            email.host = "smtp.126.com";// If it is QQ Email is: smtp:qq.com, So on 
            email.mailToArray = new string[] { "******@qq.com","12345678@qq.com"};// Recipient mail collection 
            email.mailCcArray = new string[] { "******@qq.com" };// Cc message collection 
            if (email.Send())
            {
                Response.Write("<script type='text/javascript'>alert(' Send successfully! ');history.go(-1)</script>");// The prompt will return to the current page if it is sent successfully. 
            }
            else
            {
                Response.Write("<script type='text/javascript'>alert(' Send failed! ');history.go(-1)</script>");
            }
        }