using System;
using System.Net;
using System.Net.Mail;
using System.Text;
using System.Threading;
delegate void sendDelegate(string from, string to, string subject, string body, string host, int port, string userName, string password);
/// <summary>
/// 发送电子邮件
/// </summary>
/// <param name=\"from\">发件人</param>
/// <param name=\"to\">收件人</param>
/// <param name=\"subject\">邮件主题</param>
/// <param name=\"body\">邮件内容</param>
/// <param name=\"host\">发送服务地址(smtp.qq.com)</param>
/// <param name=\"port\">发送邮件服务器端口(25) int型</param>
/// <param name=\"userName\">用户名</param>
/// <param name=\"password\">密码</param>
public void sendmail(string from, string to, string subject, string body, string host, int port, string userName, string password)
{
 MailMessage message = new MailMessage(from, to, subject, body);
 message.IsBodyHtml = true;
 message.BodyEncoding = Text.Encoding.UTF8;
 message.Attachments.Add(new Attachment(\"c:\\\\log.log\"));
 SmtpClient client = new SmtpClient(host, port);
 client.Credentials = new NetworkCredential(userName, password);
 client.DeliveryMethod = SmtpDeliveryMethod.Network;
 client.Send(message);
}
SqlConnection conn = new SqlConnection();
conn.ConnectionString = \"Data Source=(local);Integrated Security=SSPI;Initial Catalog=db_showHouse\"; 　　//打开连接
conn.Open();
SqlCommandcmd = new SqlCommand(\"select Email from Employee\", conn);
SqlDataReader drNew = cmd.ExecuteReader();
if (drNew.HasRows)
{
 while (drNew.Read())
  new sendDelegate(sendmail).BeginInvoke(\"someone@somecompany.com\",drNew[0].ToString(),\"subject\",\"body\",\"smtp.somescompany.com\",25,\"userName\",\"password\");
}
drNew.Close();