大神帮忙看看,老是报"IndexOutOfRangeException"

下面的插入数据库的操作已经屏蔽掉了,就单单读取近16000条数据就报错,使用文本分隔 还是一样报错! 
int i = -1;
            using (StreamReader m_streamreader1 = new StreamReader(FilePath, Encoding.GetEncoding("GB2312")))
            {
                i = m_streamreader1.ReadToEnd().Split('\n').Length - 1;//获取行数
            }
            string l_path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);
            int num = Convert.ToInt32(Math.Ceiling(i / 10000.00));//0x1869F0x82C_
            for (int ai = 1; ai <= num; ai++)
            {
                int flag = 0;
                string _path = l_path + "\\0x1869F0x82C_" + ai.ToString() + ".txt";
                File.Delete(_path);
                FileStream fs = new FileStream(_path, FileMode.CreateNew, FileAccess.ReadWrite);
                StreamWriter sw = new StreamWriter(fs, Encoding.GetEncoding("GB2312"));                StreamReader m_streamreader1 = new StreamReader(FilePath, Encoding.GetEncoding("GB2312"));                while (!m_streamreader1.EndOfStream)
                {
                    if (flag == 0)
                    {
                        string str = m_streamreader1.ReadLine();
                        sw.WriteLine(str);
                    }
                    else if (flag <= ai * 10000 && flag > (ai - 1) * 10000)
                    {
                        string str = m_streamreader1.ReadLine();
                        sw.WriteLine(str);
                    }
                    else
                    {
                        if ((num - ai + 1) * 10000 < flag)
                        {
                            m_streamreader1.ReadToEnd();
                        }
                        else
                        {
                            m_streamreader1.ReadLine();
                        }
                    }
                    flag++;
                }
                m_streamreader1.Close();
                sw.Close();
                fs.Close();
            }            DBHelper dbhelper = new DBHelper();
            if (IsDel == 1)
            {
                dbhelper.IDM_Data("delete from GoodInfo");
            }            progressBar1.Maximum = i;//设置最大长度值
            progressBar1.Value = 0;//设置当前值
            int fuck = 0;
            for (int bi = 1; bi <= num; bi++)
            {
                if (fuck == 12047)
                {
                    string asdfasdf = "";
                }
                string _path = l_path + "\\0x1869F0x82C_" + bi.ToString() + ".txt";
                FileStream fs = new FileStream(_path, FileMode.Open, FileAccess.Read);
                StreamReader m_streamreader = new StreamReader(fs, Encoding.GetEncoding("GB2312"));
                m_streamreader.BaseStream.Seek(0, SeekOrigin.Begin);
                int k = 0;
                int columnCount = 0;
                SqlCeConnection con = new SqlCeConnection(dbhelper.CONN_STRING);
                try
                {
                    while (!m_streamreader.EndOfStream)
                    {
                        if (k == 0)
                        {
                            columnCount = m_streamreader.ReadLine().Split(',').Length;
                            if (columnCount < 6 || columnCount > 8)
                            {
                                MessageBox.Show("数据格式不正确,导入中断!", "错误"); break;
                            }
                        }
                        else
                        {
                            fuck++;
                            decimal a = 0m;
                            decimal b = 0m;
                            string[] line = m_streamreader.ReadLine().Split(',');
                            string txt = "";
                            string txm = "";
                            if (line[1].Length > 13)
                            {
                                txm = line[1].Substring(0, 13);
                            }
                            else
                            {
                                txm = line[1];
                            }
                            if (line.Length < 6 || line.Length > 8)
                            {
                                MessageBox.Show("数据格式不正确,导入中断!", "错误"); break;
                            }
                            //txt = "delete from GoodInfo where tiaoma='" + txm + "';";
                            if (columnCount == 7)
                            {
                                if (string.IsNullOrEmpty(line[6]))
                                {
                                    txt += "insert into GoodInfo (tid,tiaoma,kuanhao,pinming,yanse,chicun,diaopaijia) values (" + line[0] + ",'" + txm + "','" + line[2] + "','" + line[3] + "','" + line[4] + "','" + line[5] + "',0);";
                                }
                                else
                                {
                                    txt += "insert into GoodInfo (tid,tiaoma,kuanhao,pinming,yanse,chicun,diaopaijia) values (" + line[0] + ",'" + txm + "','" + line[2] + "','" + line[3] + "','" + line[4] + "','" + line[5] + "'," + line[6] + ");";
                                }
                            }
                            else if (columnCount == 6)
                            {
                                txt += "insert into GoodInfo (tid,tiaoma,kuanhao,pinming,yanse,chicun,diaopaijia) values (" + line[0] + ",'" + txm + "','" + line[2] + "','" + line[3] + "','" + line[4] + "','" + line[5] + "',0);";
                            }
                            else if (columnCount == 8)
                            {
                                if (string.IsNullOrEmpty(line[6]))
                                    a = 0m;
                                else
                                    a = Convert.ToDecimal(line[6]);                                if (string.IsNullOrEmpty(line[7]))
                                    b = 0m;
                                else
                                    b = Convert.ToDecimal(line[7]);
                                txt += "insert into GoodInfo (tid,tiaoma,kuanhao,pinming,yanse,chicun,diaopaijia,lingshoujia) values (" + line[0] + ",'" + txm + "','" + line[2] + "','" + line[3] + "','" + line[4] + "','" + line[5] + "'," + a + "," + b + ");";
                            }
                            else
                            {
                                MessageBox.Show("数据格式不正确,导入中断!", "错误"); break;
                            }                            if (!string.IsNullOrEmpty(txt))
                            {
                                try
                                {
                                    //con.Open();
                                    //SqlCeCommand cmd = con.CreateCommand();
                                    //cmd.CommandText = txt;
                                    //cmd.CommandType = CommandType.Text;
                                    //int _mes = cmd.ExecuteNonQuery();
                                }
                                catch (Exception ee)
                                {
                                    if (ee.Message.IndexOf("unique", 0) > 1 || ee.Message.IndexOf("uq", 0) > 1 || ee.Message.IndexOf("UQ", 0) > 1)
                                    {
                                        MessageBox.Show("条码:" + txm + "重复,导入终止!");
                                        break;
                                    }
                                }
                                progressBar1.Value += 1;                            }
                        }
                        k++;
                    }
                }
                catch (Exception ee)
                {
                    MessageBox.Show(ee.Message, fuck.ToString() + "错误");
                }
                finally
                {
                    con.Close();
                }
                con.Close();
                //f.doReturnValue();
                m_streamreader.Close();
                fs.Close();
                //File.Delete(_path);
            }
            this.Close();