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

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;
}
}
}
}
}