public class Mail
{
#region 邮件参数
static public string accountName = System.Configuration.ConfigurationManager.AppSettings["SmtpAccountName"];
static public string password = System.Configuration.ConfigurationManager.AppSettings["SmtpAccountPW"];
static public string smtpServer = System.Configuration.ConfigurationManager.AppSettings["SmtpServer"];
static public int smtpPort = int.Parse(System.Configuration.ConfigurationManager.AppSettings["SmtpPort"]);
#endregion

/// <summary>
/// 邮件发送方法一
/// </summary>
/// <param name="sendTo"></param>
/// <param name="subject"></param>
/// <param name="body"></param>
static public void SendMail(string sendTo, string subject, string body)
{
//.net smtp
System.Web.Mail.MailMessage mailmsg = new System.Web.Mail.MailMessage();
mailmsg.To = sendTo;
//mailmsg.Cc = cc;
mailmsg.Subject = subject;
mailmsg.Body = body;
mailmsg.BodyFormat = MailFormat.Html;


//sender here
mailmsg.From = Mail.accountName;
// certify needed
mailmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");//1 is to certify
//the user id
mailmsg.Fields.Add(
"http://schemas.microsoft.com/cdo/configuration/sendusername",
Mail.accountName);
//the password
mailmsg.Fields.Add(
"http://schemas.microsoft.com/cdo/configuration/sendpassword",
Mail.password);

System.Web.Mail.SmtpMail.SmtpServer = Mail.smtpServer;

System.Web.Mail.SmtpMail.Send(mailmsg);

}
/// <summary>
/// 邮件发送方法二
/// </summary>
/// <param name="sendTo"></param>
/// <param name="subject"></param>
/// <param name="body"></param>
static public void SendMail2(string sendTo, string subject, string body)
{
System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage(accountName, sendTo, subject, body);
msg.From = new System.Net.Mail.MailAddress(accountName, "Mail");
System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient(smtpServer);
msg.IsBodyHtml = true;
client.Credentials = new System.Net.NetworkCredential(accountName, password);
client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;

client.Send(msg);
}
}

using System.Web.Mail;
public void sendMail()
{
try
{
System.Web.Mail.MailMessage myMail=new MailMessage();
myMail.From = "myaccount@test.com";
myMail.To = "myaccount@test.com";
myMail.Subject = "MailTest";
myMail.Priority = MailPriority.Low;
myMail.BodyFormat = MailFormat.Text;
myMail.Body = "Test";
SmtpMail.SmtpServer="smarthost"; //your smtp server here
SmtpMail.Send(myMail);
}
catch(Exception e)
{
throw e;
}
}