i have this code to import multi csv files & it gives error

Question

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    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.IO;
    using System.Data.SqlClient;
    using System.Data;
    using System.Configuration;
    using System.Diagnostics;
    using System.Timers;
    using System.Data.OleDb;

    namespace ConsoleApplication10
    {
        class Program
        {
            static void Main(string[] args)
            {
               string server = "NAHLA-PC";
               string database = "master";
              string SQLServerConnectionString = String.Format("Data Source={0};Initial Catalog={1};Integrated Security=SSPI", server, database);
             //   string SQLServerConnectionString = String.Format("Data Source = NAHLA - PC; Initial Catalog = master; Integrated Security = True");


                string CSVpath = @"C:\mock2\FINDATA.LOG"; // CSV file Path
                string CSVFileConnectionString = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};;Extended Properties=\"text;HDR=YES;FMT=Delimited(*)\";", CSVpath);

                var AllFiles = new DirectoryInfo(CSVpath).GetFiles("*.REQ");
                string File_Name = string.Empty;

                foreach (var file in AllFiles)
                {
                    try
                    {
                        DataTable dt = new DataTable();
                        ///////////////////////////////////////////////////////////////////////////////

                        dt.Columns.AddRange(new DataColumn[10] { new DataColumn("id", typeof(int)),
                                new DataColumn("Name", typeof(string)),
                                new DataColumn("Account", typeof(string)),
                                new DataColumn("Email_id", typeof(string)),
                                new DataColumn("Email_type", typeof(string)),
                                new DataColumn("Currency", typeof(string)),
                                new DataColumn("Amount", typeof(string)),
                                new DataColumn("Date", typeof(string)),
                                new DataColumn("TXN_id",typeof(string)),
                                new DataColumn("System_ip",typeof(string)) });

                        //////////////////////////////////////////////////////////////////////////////
                        using (OleDbConnection con = new OleDbConnection(CSVFileConnectionString))
                        {
                            con.Open();
                            var csvQuery = string.Format("select * from [{0}]", file.Name);
                            using (OleDbDataAdapter da = new OleDbDataAdapter(csvQuery, con))
                            {
                                da.Fill(dt);
                            }
                        }

                        using (SqlBulkCopy bulkCopy = new SqlBulkCopy(SQLServerConnectionString))
                        {
                            bulkCopy.ColumnMappings.Add(0, "id");
                            bulkCopy.ColumnMappings.Add(1, "Name");
                            bulkCopy.ColumnMappings.Add(2, "Account");
                            bulkCopy.ColumnMappings.Add(3, "Email_id");
                            bulkCopy.ColumnMappings.Add(4, "Email_type");
                            bulkCopy.ColumnMappings.Add(5, "Currency");
                            bulkCopy.ColumnMappings.Add(6, "Amount");
                            bulkCopy.ColumnMappings.Add(7, "Date");
                            bulkCopy.ColumnMappings.Add(8, "TXN_id");
                            bulkCopy.ColumnMappings.Add(9, "System_ip");
                            bulkCopy.DestinationTableName = "FCBCustomers";
                            bulkCopy.BatchSize = 0;
                            bulkCopy.WriteToServer(dt);
                            bulkCopy.Close();
                        }

                    }
                    catch (Exception ex)
                    {
                        throw ex;
                    }
                }
            }
        }
    }


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