C#UDP通信+文件传输

C#UDP通信+文件传输。文件传输有点问题，不能选择想保存文件的地址，是保存在了程序中写死了的地址。让我比较郁闷！

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Threading;
using System.IO;

namespace BroadcastExample
{
    public class ConnectionClient
    {
        Socket sokMsg;
        DGShowMsg dgShowMsg;//负责 向主窗体文本框显示消息的方法委托
        DGShowMsg dgRemoveConnection;// 负责 从主窗体 中移除 当前连接
        Thread threadMsg;

       

        #region 构造函数
        /// 

        /// 
        /// 

        /// 通信套接字
        /// 向主窗体文本框显示消息的方法委托
        public ConnectionClient（Socket sokMsg DGShowMsg dgShowMsg DGShowMsg dgRemoveConnection）
        {
            this.sokMsg = sokMsg;
            this.dgShowMsg = dgShowMsg;
            this.dgRemoveConnection = dgRemoveConnection;

            this.threadMsg = new Thread（RecMsg）;
            this.threadMsg.IsBackground = true;
            this.threadMsg.Start（）;
        }
        #endregion

        bool isRec = true;
        #region 02负责监听客户端发送来的消息
        void RecMsg（）
        {
            while （isRec）
            {
                try
                {
                    byte[] arrMsg = new byte[1024 * 1024 * 2];
                    //接收 对应 客户端发来的消息
                    int length = sokMsg.Receive（arrMsg）;
                    //将接收到的消息数组里真实消息转成字符串
                    string strMsg = System.Text.Encoding.UTF8.GetString（arrMsg 0 length）;
                    //通过委托 显示消息到 窗体的文本框
                    dgShowMsg（strMsg）;
                }
                catch （Exception ex）
                {
                    isRec = false;
                    //从主窗体中 移除 下拉框中对应的客户端选择项，同时 移除 集合中对应的 ConnectionClient对象
                    dgRemoveConnection（sokMsg.RemoteEndPoint.ToString（））;
                }
            }
        }
        #endregion

        #region 03向客户端发送消息
        /// 

        /// 向客户端发送消息
        /// 

        /// 
        public void Send（string strMsg）
        {
            byte[] arrMsg = System.Text.Encoding.UTF8.GetBytes（strMsg）;
            byte[] arrMsgFinal = new byte[arrMsg.Length + 1];

            arrMsgFinal[0] = 0;//设置 数据标识位等于0，代表 发送的是 文字
            arrMsg.CopyTo（arrMsgFinal 1）;

            sokMsg.Send（arrMsgFinal）;
        }
        #endregion

        #region 04向客户端发送文件数据 +void SendFile（string strPath）
        /// 

        /// 04向客户端发送文件数据
        /// 

        /// 文件路径
        public void SendFile（string strPath）
        {
            //通过文件流 读取文件内容
            using （FileStream fs = new FileStream（strPath FileMode.OpenOrCreate））
            {
                byte[] arrFile = new byte[1024 * 1024 * 2];
                //读取文件内容到字节数组，并 获得 实际文件大小
                int length = fs.Read（arrFile 0 arrFile.Length）;
                //定义一个 新数组，长度为文件实际长度 +1
                byte[] arrFileFina

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

     文件      17920  2011-10-20 16:23  BroadcastExample\BroadcastExample\bin\Debug\BroadcastExample.exe

     文件      42496  2011-10-20 16:23  BroadcastExample\BroadcastExample\bin\Debug\BroadcastExample.pdb

     文件      14328  2011-10-20 16:05  BroadcastExample\BroadcastExample\bin\Debug\BroadcastExample.vshost.exe

     文件        490  2007-07-21 01:33  BroadcastExample\BroadcastExample\bin\Debug\BroadcastExample.vshost.exe.manifest

     文件       3534  2011-10-19 15:25  BroadcastExample\BroadcastExample\BroadcastExample.csproj

     文件       4623  2011-10-19 15:25  BroadcastExample\BroadcastExample\ConnectionClient.cs

     文件      18495  2011-10-20 16:14  BroadcastExample\BroadcastExample\Form1.cs

     文件       6662  2011-10-20 14:37  BroadcastExample\BroadcastExample\Form1.Designer.cs

     文件       5814  2011-10-20 14:37  BroadcastExample\BroadcastExample\Form1.resx

     文件       1502  2010-05-06 16:15  BroadcastExample\BroadcastExample\obj\BroadcastExample.csproj.FileListAbsolute.txt

     文件       2254  2011-10-20 16:05  BroadcastExample\BroadcastExample\obj\Debug\BroadcastExample.csproj.FileListAbsolute.txt

     文件        847  2011-10-20 14:37  BroadcastExample\BroadcastExample\obj\Debug\BroadcastExample.csproj.GenerateResource.Cache

     文件      17920  2011-10-20 16:23  BroadcastExample\BroadcastExample\obj\Debug\BroadcastExample.exe

     文件        180  2011-10-20 14:37  BroadcastExample\BroadcastExample\obj\Debug\BroadcastExample.Form1.resources

     文件      42496  2011-10-20 16:23  BroadcastExample\BroadcastExample\obj\Debug\BroadcastExample.pdb

     文件        180  2011-10-20 10:24  BroadcastExample\BroadcastExample\obj\Debug\BroadcastExample.Properties.Resources.resources

     文件       4608  2011-09-27 16:45  BroadcastExample\BroadcastExample\obj\Debug\TempPE\Properties.Resources.Designer.cs.dll

     文件        491  2011-10-20 14:14  BroadcastExample\BroadcastExample\Program.cs

     文件       1204  2010-04-26 22:31  BroadcastExample\BroadcastExample\Properties\AssemblyInfo.cs

     文件       2856  2011-05-09 16:03  BroadcastExample\BroadcastExample\Properties\Resources.Designer.cs

     文件       5612  2010-04-26 22:31  BroadcastExample\BroadcastExample\Properties\Resources.resx

     文件       1114  2011-05-09 16:03  BroadcastExample\BroadcastExample\Properties\Settings.Designer.cs

     文件        249  2010-04-26 22:31  BroadcastExample\BroadcastExample\Properties\Settings.settings

     文件        938  2011-05-09 16:03  BroadcastExample\BroadcastExample.sln

    ..A..H.     18944  2011-10-19 16:54  BroadcastExample\BroadcastExample.suo

     文件       1189  2011-05-09 16:03  BroadcastExample\UpgradeLog.xml

     文件       3348  2011-05-09 16:03  BroadcastExample\_UpgradeReport_Files\UpgradeReport.css

     文件      12505  2008-01-11 01:25  BroadcastExample\_UpgradeReport_Files\UpgradeReport.xslt

     文件         69  2011-05-09 16:03  BroadcastExample\_UpgradeReport_Files\UpgradeReport_Minus.gif

     文件         71  2011-05-09 16:03  BroadcastExample\_UpgradeReport_Files\UpgradeReport_Plus.gif

............此处省略14个文件信息