用c#写的smtp邮件发送类

//**********************Created by Chen**************************
using System;
using System.IO;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Collections;
using System.Collections.Specialized;
using KSN.Exceptions;
using KSN.Validate;
namespace KSN.Web.Mail
{
/// <summary>
/// 邮件内容
/// </summary>
public class MailMessage
{
private string sender=null;
private StringCollection receivers=new StringCollection();
private string subject="";
private string xMailer="";
private StringCollection attachments=new StringCollection();
private MailEncodings mailEncoding=MailEncodings.GB2312;
private MailTypes mailType=MailTypes.Html;
private byte[] mailBody=null;
/// <summary>
/// 获取或设置发件人
/// </summary>
public string Sender
{
get{return this.sender;}
set{this.sender=value;}
}
/// <summary>
/// 获取收件人地址集合
/// </summary>
public StringCollection Receivers
{
get{return this.receivers;}
}
/// <summary>
/// 获取或设置邮件主题
/// </summary>
public string Subject
{
get{return this.subject;}
set{this.subject=value;}
}
/// <summary>
/// 获取或设置邮件传送者
/// </summary>
public string XMailer
{
get{return this.xMailer;}
set{this.xMailer=value;}

补充：asp.net教程,C语言