C#版文件分割器

直接上图，接着上一篇的文本分割器，实验要求如下：
1. 能进行文件分割
2. 分割块大小由用户输入决定
3. 能进行文件合并
4. 文件分割与合并过程用线程来实现
5. 数据缓冲区不得超过2K
6. 要有处理进度显示

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Threading;

namespace WindowsFormsApplication1
{
    public partial class 文件分割器1 : Form
    {
        //时间：2012-9-6
        //作者：Olive
        //功能：实现大文件的分割、合并
        #region Members
        int count1,count,fgkDaXiao;
        FileInfo fFenGe,fHeBing;
        FileStream fStream,hStream;
        string fenGeLuJing,heBingLuJing;
        int value = 0;
        #endregion

        #region Methods
        public 文件分割器1()
        {
            InitializeComponent();
            skinEngine1.SkinFile = "WarmColor1.ssk";
        }

        /// <summary>
        ///   选择要分割的文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnfgwenjian_Click(object sender, EventArgs e)
        {
            try
            {
                if (openFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    fFenGe = new FileInfo(openFileDialog1.FileName);
                    txtfenge.Text = fFenGe.FullName;

                    fenGeLuJing = fFenGe.FullName.Substring(0, fFenGe.FullName.Length - openFileDialog1.SafeFileName.Length);
                    txtwjdaxiao.Text = ((int)fFenGe.Length/1024).ToString();
                    fStream = new FileStream(fFenGe.FullName, FileMode.Open, FileAccess.Read);
                }
            }
            catch
            {
                MessageBox.Show("文件分割异常，请检查确认无误后再次分割！");
            }

        }
        /// <summary>
        /// 选择要保存的路径，如果不选默认为与原文件同路径
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnfglujing_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(txtfgkdaxiao.Text))
            {
                MessageBox.Show("请输入文件分割块大小！");
            }
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
               txtfglujing.Text= folderBrowserDialog1.SelectedPath;
               fenGeLuJing = folderBrowserDialog1.SelectedPath+"\\";
            }
        }
        /// <summary>
        /// 分割文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnfenge_Click(object sender, EventArgs e)
        {
            try
            {
                int wenJianLength = Convert.ToInt32(txtwjdaxiao.Text);

                if (wenJianLength % fgkDaXiao == 0)
                {
                    count = wenJianLength / fgkDaXiao;
                }
                else
                {
                    count = wenJianLength / fgkDaXiao + 1;
                }
        &

补充：软件开发 , C# ,