如何把C#中的内存流 存放到一个TXT文档中，并且可以也可以读出数据，显示在一个txt文本框中

 public static class StreamHelper

    {

        public static Encoding GetEncoding(Stream stream, Encoding defaultEncoding)

        {

            Encoding targetEncoding = defaultEncoding;



            if (stream == null) return targetEncoding;

            if (stream.Length < 3) return targetEncoding;



            byte byte1, byte2, byte3;



            //保存当前Seek位置

            long origPos = stream.Seek(0, SeekOrigin.Begin);

            byte1 = Convert.ToByte(stream.ReadByte());

            byte2 = Convert.ToByte(stream.ReadByte());

            byte3 = Convert.ToByte(stream.ReadByte());



            //根据文件流的前3个字节判断Encoding          

            if (byte1 == 0xFE && byte2 == 0xFF)//UnicodeBe

            {

                targetEncoding = Encoding.BigEndianUnicode;

            }



            if (byte1 == 0xFF && byte2 == 0xFE && byte3 != 0xFF)//Unicode

            {

                targetEncoding = Encoding.Unicode;

            }



            if (byte1 == 0xEF && byte2 == 0xBB && byte3 == 0xBF)//UTF8

            {

                targetEncoding = Encoding.UTF8;

            }



            //恢复Seek位置

            stream.Seek(origPos, SeekOrigin.Begin);



            return targetEncoding;

        }

    } 





 private void InitComboBox()

        {

            List<string> ServerNames = new List<string>();

            ServerNames = this.LoadName();

            this.cmbServer.Items.AddRange(ServerNames.ToArray());

            this.cmbCategory.Items.AddRange(new string[] { "Error", "Exception", "Info" });

        }



        private void SetSavePath(ref string savePath)

        {

            FolderBrowserDialog FolderPath = new FolderBrowserDialog();

            FolderPath.ShowDialog();

            savePath = FolderPath.SelectedPath;

        }



 private void btnDownloadBatch_Click(object sender, EventArgs e)

        {

            DateTime dt = this.dtpStart.Value;

            string savePath = String.Empty;



            Server = this.cmbServer.Text;

            Path = this.txtPath.Text + @"\Log\" + cmbCategory.Text;

            if (!Directory.Exists(Path)) { MessageBox.Show("路径不存在"); return; }

            SetSavePath(ref savePath);



            //下面那两句防止间隔小于24小时但跨越两天才算一天的情况

            DateTime start = new DateTime(this.dtpStart.Value.Year, this.dtpStart.Value.Month, this.dtpStart.Value.Day, 0, 0, 0);

            DateTime end =  new DateTime(this.dtpEnd.Value.Year, this.dtpEnd.Value.Month, this.dtpEnd.Value.Day, 23, 59, 59);



            TimeSpan ts = end - start;

            double dDays = ts.TotalDays;//带小数的天数，比如1天12小时结果就是1.5 

            int DateCount = (int)Math.Ceiling(dDays);//返回有效数就进一的整数



            this.progressBar1.Value = 0;

            DownLoadBatch(dt, end, DateCount, savePath);          

        }

补充：.NET技术 ,  C#

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