Dotnet1.1 and 2.0 SendMail detail to explain

/**********************************************************************
**
** DotNet1.1环境下 Code CreateByBANLAO 2005.6.14
**
**********************************************************************/

using System.Web.Mail;

public void _Dotnet1.1SendMail()
{
strMessage = ""; //定义错误信息

MailMessage mailMsg = new MailMessage();
mailMsg.From = strMailFrom;

mailMsg.To = strMailTo;
mailMsg.Subject = strMailTitle;
mailMsg.Priority = MailPriority.High; //邮件级别，.High、.Low、.Normal
mailMsg.BodyFormat = MailFormat.Text; //邮件形式，.Text、.Html
mailMsg.Body = strEmailBody;

mailMsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //设置支持服务器验证
mailMsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", strMailFrom); //设置用户名
mailMsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", strPsd); //设置用户密码

SmtpMail.SmtpServer = strMailSMTP; //or SmtpMail.SmtpServer.Insert( 0, strMailSMTP);
try
{
//发送邮件
SmtpMail.Send( mailMsg );
}
catch( Exception Message )
{
strMessage = "发送失败" + Message.Message.ToString();
}

if( strMessage != "" )
{
Response.Write(strMessage );
}
else
{
Response.Write("发送成功！");
}
}

/**********************************************************************
**
** DotNet2.0环境下 Code CreateBy BANLAO 2006.11.23
**
**********************************************************************/

using System.Net.Mail;

public void _Dotnet2.0SendMail()
{
strMessage = "";

MailMessage mailMsg = new MailMessage();

mailMsg.To.Add(new MailAddress("收件人邮箱集合")); //设置收件人的邮件地址
mailMsg.From = new MailAddress("发件人邮箱地址"); //设置发送者的邮件地址
mailMsg.Subject = strMailTitle; //设置邮件主题
mailMsg.Priority = MailPriority.High; // 设置邮件级别：.High、.Low、.Normal
mailMsg.IsBodyHtml = true; //设置邮件形式：是否为HTML格式
mailMsg.SubjectEncoding = System.Text.Encoding.UTF8;
mailMsg.BodyEncoding = System.Text.Encoding.UTF8;
mailMsg.Body = strEmailHTML;

//设置发送邮件服务器
SmtpClient client = new SmtpClient(strMailSMTPServer);

client.Credentials = new System.Net.NetworkCredential("发件人邮箱", "发件人邮箱密码");
client.EnableSsl = true; //经过SSL加密

try
{
client.Send(mailMsg);
}
catch (Exception Message)
{
strMessage = "发送失败" + Message.Message.ToString();
}

if( strMessage != "" )
{
Response.Write(strMessage );
}
else
{
Response.Write("发送成功！");
}
}