c# 发送邮件

using System;
using System.Web;

namespace HuaTong.General.Utility
{
    /// <summary>
    /// 邮件发送
    /// </summary>
    public class EmailHelper
    {
        string MailAddress = "";
        string MailName = "";
        string MailHost = "";
        string MailPassword = "";

        public EmailHelper(string mailAddress, string mailName, string mailHost, string mailPassword)
        {
            MailAddress = mailAddress;
            MailName = mailName;
            MailHost = mailHost;
            MailPassword = mailPassword;
        }

        /// <summary>
        /// 发送邮件
        /// </summary>
        public bool SendMail(string subject, string body, string to, bool Ishtml)
        {
            using (System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage())
            {
                msg.To.Add(to);
                msg.From = new System.Net.Mail.MailAddress(MailAddress, MailName, System.Text.Encoding.UTF8);
                msg.Subject = subject;//邮件标题             
                msg.SubjectEncoding = System.Text.Encoding.UTF8;//邮件标题编码 
                msg.Body = body;//邮件内容 
                msg.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码 
                msg.IsBodyHtml = Ishtml;//是否是HTML邮件 
                msg.Priority = System.Net.Mail.MailPriority.Normal;//邮件优先级
                System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
                client.Credentials = new System.Net.NetworkCredential(MailAddress, MailPassword);
                client.Host = MailHost;
                object userState = msg;
                try
                {
                    client.Send(msg);
                    return true;
                }
                catch
                {
                    return false;
                }
            }
        }
    }
}