为什么我使用断点上传的文件打不开？？

客户端代码如下：
      Service525.Service1 ser = new WindowsFormsApplication4.Service525.Service1();  private void button1_Click(object sender, EventArgs e)
        {           
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.ShowDialog();
             string  localFileName = ofd.FileName.ToString();
            string ziliaoname = Path.GetFileName(localFileName);
            int length;
            int count1 = 1024 * 100;          
            FileStream fs = new FileStream(ofd.FileName, FileMode.Open, FileAccess.Read)；           
            byte[] bt = new byte[count1];         
           length = fs.Read(bt, 0, bt.Length);
            int i = UploadStream(localFileName, ziliaoname, length);
            if (i == 0)
            {
                MessageBox.Show("成功");
                this.Close();
            }
        }
        private int UploadStream(string localFileName, string ziliaoname, int iExists)
        { Stream stream = null;
            try  {stream = new FileInfo(localFileName).OpenRead();
                int size = 1024 * 64;
                byte[] buffer = new byte[size];//以每次64K的大小传递流 
                int index = 0, count = size;
                if (stream.Length < size)
                {count = (int)stream.Length;
                    buffer = new byte[stream.Length];}
                stream.Position = iExists;
                while ((count = stream.Read(buffer, 0, count)) != 0)
                {
                    ser.Upload(ziliaoname, iExists + index, buffer);
                    index += count;
                    if (count != size)
                    {  break; }
                }}
            catch (Exception ex)
            { MessageBox.Show(ex.Message);}
            finally
            { if (stream != null)
                {  stream.Close();} }
            return 0;
        } 
    }
服务器端代码如下：
 [WebMethod]
        public bool Upload(string fileName, long offSet, byte[] intoBuffer)
        {
            //指定上传文件夹+文件名(相对路径)
           // string strPath = System.Configuration.ConfigurationManager.AppSettings["filePah"].ToString();
            //将相对路径转换成服务器的绝对路径
            string strPath1 = Server.MapPath("~/filePah");
            if (offSet < 0)
            {
                offSet = 0;
            }
            byte[] buffer = intoBuffer;
            if (buffer != null)
            {
                //读写文件的文件流,支持同步读写也支持异步读写
                FileStream filesStream = new FileStream(strPath1 + "/" + fileName, FileMode.Create, FileAccess.Write);
                filesStream.Seek(offSet, SeekOrigin.Begin);
                filesStream.Write(buffer, 0, buffer.Length);
                filesStream.Flush();
                filesStream.Close();
                filesStream.Dispose();
                return true;
            }
            return false;
        }