简单的电子邮件收发系统

用C#开发，在VS2005下能运行。可以参考学习

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace WindowsApplication1
{
    class cc
    {
        #region 创建一个TXT文件来保存邮件发送的信息。
        public void write（string _sender string _sendfrom string _sendtitle string _Attachmentstring _sendcontent）
        {
            FileStream fs;
            FileInfo f1;
            string fileName = “sendMail.txt“;
            
                if （File.Exists（@“e:\“ + fileName））
                {
                    f1 = new FileInfo（@“e:\“ + fileName）;
                    f1.Delete（）;
                }
              
                    fs = new FileStream（@“e:\“ + fileName FileMode.Create）;
                    fs.Close（）;
                  StreamWriter sw = new StreamWriter（@“e:\“ + fileName）;
                  sw.WriteLine（_sender）;
                    sw.WriteLine（_sendfrom）;
                    sw.WriteLine（_sendtitle）;
                    sw.WriteLine（_Attachment）;
                    sw.Write（_sendcontent）;
                    sw.Close（）;
                }
        #endregion
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件      28672  2009-06-10 16:06  贾昊7040217\WindowsApplication1\bin\Debug\WindowsApplication1.exe

     文件      48640  2009-06-10 16:06  贾昊7040217\WindowsApplication1\bin\Debug\WindowsApplication1.pdb

     文件       5632  2005-12-08 14:51  贾昊7040217\WindowsApplication1\bin\Debug\WindowsApplication1.vshost.exe

     文件       1141  2009-06-10 11:13  贾昊7040217\WindowsApplication1\cc.cs

     文件        985  2009-06-10 14:47  贾昊7040217\WindowsApplication1\Form1.cs

     文件       2665  2009-06-03 15:46  贾昊7040217\WindowsApplication1\Form1.Designer.cs

     文件       5814  2009-06-03 15:46  贾昊7040217\WindowsApplication1\Form1.resx

     文件        969  2009-06-10 11:21  贾昊7040217\WindowsApplication1\obj\Debug\WindowsApplication1.csproj.GenerateResource.Cache

     文件      28672  2009-06-10 16:06  贾昊7040217\WindowsApplication1\obj\Debug\WindowsApplication1.exe

     文件        180  2009-06-03 21:34  贾昊7040217\WindowsApplication1\obj\Debug\WindowsApplication1.Form1.resources

     文件      48640  2009-06-10 16:06  贾昊7040217\WindowsApplication1\obj\Debug\WindowsApplication1.pdb

     文件        180  2009-06-03 21:34  贾昊7040217\WindowsApplication1\obj\Debug\WindowsApplication1.Properties.Resources.resources

     文件        180  2009-06-10 11:21  贾昊7040217\WindowsApplication1\obj\Debug\WindowsApplication1.receivContent.resources

     文件        180  2009-06-04 13:48  贾昊7040217\WindowsApplication1\obj\Debug\WindowsApplication1.SendMail.resources

     文件        457  2009-06-01 03:36  贾昊7040217\WindowsApplication1\obj\WindowsApplication1.csproj.FileList.txt

     文件       3000  2009-08-13 02:24  贾昊7040217\WindowsApplication1\obj\WindowsApplication1.csproj.FileListAbsolute.txt

     文件        478  2009-06-03 14:27  贾昊7040217\WindowsApplication1\Program.cs

     文件       1200  2009-06-01 22:22  贾昊7040217\WindowsApplication1\Properties\AssemblyInfo.cs

     文件       2894  2009-06-01 22:22  贾昊7040217\WindowsApplication1\Properties\Resources.Designer.cs

     文件       5612  2009-06-01 22:22  贾昊7040217\WindowsApplication1\Properties\Resources.resx

     文件       1104  2009-06-01 22:22  贾昊7040217\WindowsApplication1\Properties\Settings.Designer.cs

     文件        249  2009-06-01 22:22  贾昊7040217\WindowsApplication1\Properties\Settings.settings

     文件       1611  2009-06-10 14:48  贾昊7040217\WindowsApplication1\receivContent.cs

     文件       7874  2009-06-10 11:21  贾昊7040217\WindowsApplication1\receivContent.Designer.cs

     文件       6017  2009-06-10 11:21  贾昊7040217\WindowsApplication1\receivContent.resx

     文件        762  2009-06-10 11:11  贾昊7040217\WindowsApplication1\recieve.cs

     文件       2476  2009-06-10 11:12  贾昊7040217\WindowsApplication1\security.cs

     文件       3570  2009-06-10 15:31  贾昊7040217\WindowsApplication1\SendMail.cs

     文件       8979  2009-06-04 13:48  贾昊7040217\WindowsApplication1\SendMail.Designer.cs

     文件       6017  2009-06-04 13:48  贾昊7040217\WindowsApplication1\SendMail.resx

............此处省略15个文件信息