发送邮件
方法：
public static bool SendMail(string From,string To,string Subject,string Baby)
{
try
{
MailMessage msg = new MailMessage(From,To,Subject,Baby);
SmtpClient smtp = new SmtpClient( "localhost ");
smtp.Send(msg);
return true;
}
catch
{
return false;
}

}

调用：
Functions.SendMail( "Eseate.net ", "yufei1237@163.com ", "注册验证 ", "验证邮件 ");
第一次做，找人教教,最好能加好友

[解决办法]
很简单就这么几句
步骤1:using System.Net.Mail;

步骤2: #region 电子邮件发送新密码给用户
private void SendEmail()
{
try
{
MailMessage m_message = new MailMessage();

m_message.From = new MailAddress( "admin@xunku.cn ");

m_message.To.Add(new MailAddress( "hzl091@126.com "));

m_message.Subject = "hello ";

m_message.Body = "正在进行邮件发送测试, <font color= 'red '> <a href= 'http://www.xunku.cn '> 去讯酷看看 </a> </font> ";

SmtpClient m_smtpClient = new SmtpClient();

m_smtpClient.Send(m_message);

}
catch (Exception ex)
{
throw ex;
}
}
#endregion 电子邮件发送新密码给用户

步骤3:配置web.config(可以利用网站管理工具来配置)
<system.net>
<mailSettings>
<smtp from= "admin@xunku.cn ">
<network host= "mail.xunku.cn " password= "******** " userName= "admin@xunku.cn " />
</smtp>
</mailSettings>
</system.net>

注意:特别要说明的是有些免费邮箱是不支持SMTP协议的,所以如果你用下面的配置发送邮件将会失败
<system.net>
<mailSettings>
<smtp from= "hzl091@163.com ">
<network host= "mail.163.com " password= "******** " userName= "hzl091@163.com " />
</smtp>
</mailSettings>
</system.net>

所以一定要找一个支持SMTP的邮件服务器才行
[解决办法]
我用的函数：
public static void SendMail(string strSmtpServer, string strForm, string strFormPass, string strto, string strSubject, string strBody)
{

System.Net.Mail.SmtpClient clint = new SmtpClient(strSmtpServer);
clint.UseDefaultCredentials = false;
clint.Credentials = new System.Net.NetworkCredential(strForm, strFormPass);

clint.DeliveryMethod = SmtpDeliveryMethod.Network;
System.Net.Mail.MailMessage message = new MailMessage(strForm, strto, strSubject, strBody);
System.Text.Encoding.GetEncoding( "gb2312 ");
message.SubjectEncoding = Encoding.GetEncoding( "gb2312 ");
message.BodyEncoding = Encoding.GetEncoding( "gb2312 ");
message.IsBodyHtml = true;
message.Priority = MailPriority.Normal;
message.IsBodyHtml = true;
clint.Send(message);
}
调用方法：SendMail( "smtp.163.com ", "账户@163.com ", "密码 ", "收件箱 ", "您在MySun系统注册的密码 ", "用户名: " + TxtName.Text + " <br> 密码: " + TxtPwd.Text);