c# 读取串口写入数据库

用c#编写的winform程序，读取串口的数据，并写入本地的sqlite数据库，同时写入SQLServer网络数据库，这个过程都是多线程的。

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.IO.Ports;
using System.Data.SqlClient;
using System.Configuration;
using System.Reflection;
using System.Data.SQLite;
using System.Threading;
using System.Runtime.InteropServices;

namespace SerialPortRSTool
{
    public partial class Form1 : Form
    {
        static log4net.ILog LOG = log4net.LogManager.GetLogger（Methodbase.GetCurrentMethod（）.DeclaringType）;
        [DllImport（“kernel32“）]
        private static extern long WritePrivateProfileString（string section string key string val string filePath）;
        [DllImport（“kernel32“）]
        private static extern int GetPrivateProfileString（string section string key string def StringBuilder retVal int size string filePath）;

        SerialPort sp = new SerialPort（）;
        List bu

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2013-07-12 17:45  SerialPortRSTool\
     目录           0  2013-07-15 12:01  SerialPortRSTool\SerialPortRSTool\
     文件         890  2013-07-12 17:45  SerialPortRSTool\SerialPortRSTool.sln
     文件       24064  2013-08-12 19:21  SerialPortRSTool\SerialPortRSTool.suo
     文件        1022  2013-07-16 15:29  SerialPortRSTool\SerialPortRSTool\App.config
     目录           0  2013-07-12 17:45  SerialPortRSTool\SerialPortRSTool\bin\
     目录           0  2013-07-23 21:46  SerialPortRSTool\SerialPortRSTool\bin\Debug\
     文件         239  2013-08-12 18:39  SerialPortRSTool\SerialPortRSTool\bin\Debug\config.ini
     目录           0  2013-08-12 19:21  SerialPortRSTool\SerialPortRSTool\bin\Debug\Log\
     文件      286720  2013-07-10 11:32  SerialPortRSTool\SerialPortRSTool\bin\Debug\log4net.dll
     文件      124416  2013-08-12 19:19  SerialPortRSTool\SerialPortRSTool\bin\Debug\SerialPortRSTool.exe
     文件        1022  2013-07-16 15:29  SerialPortRSTool\SerialPortRSTool\bin\Debug\SerialPortRSTool.exe.config
     文件       42496  2013-08-12 19:19  SerialPortRSTool\SerialPortRSTool\bin\Debug\SerialPortRSTool.pdb
     文件       11600  2013-08-12 19:20  SerialPortRSTool\SerialPortRSTool\bin\Debug\SerialPortRSTool.vshost.exe
     文件        1022  2013-07-16 15:29  SerialPortRSTool\SerialPortRSTool\bin\Debug\SerialPortRSTool.vshost.exe.config
     文件         490  2010-03-17 22:39  SerialPortRSTool\SerialPortRSTool\bin\Debug\SerialPortRSTool.vshost.exe.manifest
     文件      904704  2010-04-18 13:58  SerialPortRSTool\SerialPortRSTool\bin\Debug\System.Data.SQLite.dll
     文件       57226  2010-04-18 13:34  SerialPortRSTool\SerialPortRSTool\bin\Debug\System.Data.SQLite.lib
     文件      184765  2010-04-18 13:34  SerialPortRSTool\SerialPortRSTool\bin\Debug\System.Data.SQLite.xml
     文件           1  2013-07-15 12:01  SerialPortRSTool\SerialPortRSTool\ClassDiagram1.cd
     文件       27493  2013-08-12 19:19  SerialPortRSTool\SerialPortRSTool\Form1.cs
     文件       26592  2013-08-12 19:13  SerialPortRSTool\SerialPortRSTool\Form1.Designer.cs
     文件      146206  2013-08-12 19:13  SerialPortRSTool\SerialPortRSTool\Form1.resx
     目录           0  2013-07-12 17:45  SerialPortRSTool\SerialPortRSTool\obj\
     目录           0  2013-07-12 17:45  SerialPortRSTool\SerialPortRSTool\obj\x86\
     目录           0  2013-08-12 19:19  SerialPortRSTool\SerialPortRSTool\obj\x86\Debug\
     文件        4501  2013-07-13 15:44  SerialPortRSTool\SerialPortRSTool\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6476  2013-08-12 19:19  SerialPortRSTool\SerialPortRSTool\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件       17099  2013-07-15 11:42  SerialPortRSTool\SerialPortRSTool\obj\x86\Debug\ResolveAssemblyReference.cache
     文件         676  2013-08-12 19:20  SerialPortRSTool\SerialPortRSTool\obj\x86\Debug\SerialPortRSTool.csproj.FileListAbsolute.txt
     文件      124416  2013-08-12 19:19  SerialPortRSTool\SerialPortRSTool\obj\x86\Debug\SerialPortRSTool.exe
............此处省略13个文件信息