asp.netc#如何实现邮件群发

这是我写的一个发邮件方法，可以参考一下：
public void SendMail(string MessageFrom,string name,string password,string MessageTo,string MessageSubject,string MessageBody,string MailServer,string fileName)
{
SmtpMail.SmtpServer =MailServer;

MailMessage oMessage = new MailMessage();

oMessage.BodyFormat = MailFormat.Html;
oMessage.Priority = MailPriority.Normal;
oMessage.From = MessageFrom;
oMessage.To = MessageTo;
oMessage.Subject = MessageSubject;

//Stmp authentication
oMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
oMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", name);
oMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword",password);

oMessage.Body = MessageBody;

MailAttachment oAttachment=null;

if(File.Exists(fileName))
{
oAttachment = new MailAttachment(fileName);
oMessage.Attachments.Add(oAttachment);
}

try
{
System.Console.WriteLine("Sending outgoing message......");
SmtpMail.Send(oMessage);
}
catch( System.Web.HttpException exHttp )
{
System.Console.WriteLine("Exception occurred: " +
exHttp.Message);
}
}