how to import csv data into Oracle using c #

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C#3.5

Hello,
How to import csv data into Oracle using c #. Where data to be imported 3GB in size and number of rows 7512263. I've managed to import csv data into Oracle, but the time it takes about 1 hour. How to speed up the time it takes to import csv data into oracle. Thank you.
This is my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Threading;
using System.Text.RegularExpressions;
using System.IO;
using FileHelpers;
using System.Data.OracleClient;


namespace sqlloader
{
    class Program
    {

        static void Main(string[] args)
        {
            int jum;
            int i;
            bool isFirstLine = false;
            FileHelperEngine engine = new FileHelperEngine(typeof(XL_XDR));

            //Connect To Database
            string constr = "Data Source=(DESCRIPTION=(ADDRESS_LIST="
                 + "(ADDRESS=(PROTOCOL=TCP)(HOST= pt-9a84825594af )(PORT=1521 )))"
                 + "(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=o11g)));"
                 + "User Id=xl;Password=rahasia;";
            OracleConnection con = new OracleConnection(constr);
            con.Open();



            // To Read Use:
            XL_XDR[] res = engine.ReadFile("DataOut.csv") as XL_XDR[];


            jum = CountLinesInFile("DataOut.csv");

            FileInfo f2 = new FileInfo("DataOut.csv");
            long s2 = f2.Length;
            int jmlRecord = jum - 1;

            for (i = 0; i < jum; i++)
            {
                ShowPercentProgress("Processing...", i, jum);
                Thread.Sleep(100);

                if (isFirstLine == false)
                {
                    isFirstLine = true;
                }
                else
                {
                    string sql = "INSERT INTO XL_XDR (XDR_ID, XDR_TYPE, SESSION_START_TIME, SESSION_END_TIME, SESSION_LAST_UPDATE_TIME, " +
                                 "SESSION_FLAG, VERSION, CONNECTION_ROW_COUNT, ERROR_CODE, METHOD, HOST_LEN, HOST, URL_LEN, URL, CONNECTION_START_TIME, " +
                                 "CONNECTION_LAST_UPDATE_TIME, CONNECTION_FLAG, CONNECTION_ID, TOTAL_EVENT_COUNT, TUNNEL_PAIR_ID, RESPONSIVENESS_TYPE, " +
                                 "CLIENT_PORT, PAYLOAD_TYPE, VIRTUAL_TYPE, VID_CLIENT, VID_SERVER, CLIENT_ADDR, SERVER_ADDR, CLIENT_TUNNEL_ADDR, " +
                                 "SERVER_TUNNEL_ADDR, ERROR_CODE_2, IPID, C2S_PKTS, C2S_OCTETS, S2C_PKTS, S2C_OCTETS, NUM_SUCC_TRANS, CONNECT_TIME, " +
                                 "TOTAL_RESP, TIMEOUTS, RETRIES, RAI, TCP_SYNS, TCP_SYN_ACKS, TCP_SYN_RESETS, TCP_SYN_FINS, EVENT_TYPE, FLAGS, TIME_STAMP, " +
                                 "EVENT_ID, EVENT_CODE) VALUES (" +
                                 "'" + res[i].XDR_ID + "', '" + res[i].XDR_TYPE + "', '" + res[i].SESSION_START_TIME + "', '" + res[i].SESSION_END_TIME + "', " +
                                 "'" + res[i].SESSION_LAST_UPDATE_TIME + "', '" + res[i].SESSION_FLAG + "', '" + res[i].VERSION + "', '" + res[i].CONNECTION_ROW_COUNT + "', " +
                                 "'" + res[i].ERROR_CODE + "', '" + res[i].METHOD + "', '" + res[i].HOST_LEN + "', '" + res[i].HOST + "', " +
                                 "'" + res[i].URL_LEN + "', '" + res[i].URL + "', '" + res[i].CONNECTION_START_TIME + "', '" + res[i].CONNECTION_LAST_UPDATE_TIME + "', " +
                                 "'" + res[i].CONNECTION_FLAG + "', '" + res[i].CONNECTION_ID + "', '" + res[i].TOTAL_EVENT_COUNT + "', '" + res[i].TUNNEL_PAIR_ID + "', " +
                                 "'" + res[i].RESPONSIVENESS_TYPE + "', '" + res[i].CLIENT_PORT + "', '" + res[i].PAYLOAD_TYPE + "', '" + res[i].VIRTUAL_TYPE + "', " +
                                 "'" + res[i].VID_CLIENT + "', '" + res[i].VID_SERVER + "', '" + res[i].CLIENT_ADDR + "', '" + res[i].SERVER_ADDR + "', " +
                                 "'" + res[i].CLIENT_TUNNEL_ADDR + "', '" + res[i].SERVER_TUNNEL_ADDR + "', '" + res[i].ERROR_CODE_2 + "', '" + res[i].IPID + "', " +
                                 "'" + res[i].C2S_PKTS + "', '" + res[i].C2S_OCTETS + "', '" + res[i].S2C_PKTS + "', '" + res[i].S2C_OCTETS + "', " +
                                 "'" + res[i].NUM_SUCC_TRANS + "', '" + res[i].CONNECT_TIME + "', '" + res[i].TOTAL_RESP + "', '" + res[i].TIMEOUTS + "', " +
                                 "'" + res[i].RETRIES + "', '" + res[i].RAI + "', '" + res[i].TCP_SYNS + "', '" + res[i].TCP_SYN_ACKS + "', " +
                                 "'" + res[i].TCP_SYN_RESETS + "', '" + res[i].TCP_SYN_FINS + "', '" + res[i].EVENT_TYPE + "', '" + res[i].FLAGS + "', " +
                                 "'" + res[i].TIME_STAMP + "', '" + res[i].EVENT_ID + "', '" + res[i].EVENT_CODE + "')";
                    
                    OracleCommand command = new OracleCommand(sql, con);
                    command.ExecuteNonQuery();
                    
                }

                

               
            }

            Console.WriteLine("Successfully Inserted");
            Console.WriteLine();
            Console.WriteLine("Number of Row Data: " + jmlRecord.ToString());
            Console.WriteLine();
            Console.WriteLine("The size of {0} is {1} bytes.", f2.Name, f2.Length);
            con.Close();
            


           
        }

        static void ShowPercentProgress(string message, int currElementIndex, int totalElementCount)
        {
            if (currElementIndex < 0 || currElementIndex >= totalElementCount)
            {
                throw new InvalidOperationException("currElement out of range");
            }
            int percent = (100 * (currElementIndex + 1)) / totalElementCount;
            Console.Write("\r{0}{1}% complete", message, percent);
            if (currElementIndex == totalElementCount - 1)
            {
                Console.WriteLine(Environment.NewLine);
            }
        }

        static int CountLinesInFile(string f)
        {
            int count = 0;
            using (StreamReader r = new StreamReader(f))
            {
                string line;
                while ((line = r.ReadLine()) != null)
                {
                    count++;
                }
            }
            return count;
        }

    }

    [DelimitedRecord(",")]
    public class XL_XDR
    {
        public string XDR_ID;
        public string XDR_TYPE;
        public string SESSION_START_TIME;
        public string SESSION_END_TIME;
        public string SESSION_LAST_UPDATE_TIME;
        public string SESSION_FLAG;
        public string VERSION;
        public string CONNECTION_ROW_COUNT;
        public string ERROR_CODE;
        public string METHOD;
        public string HOST_LEN;
        public string HOST;
        public string URL_LEN;
        public string URL;
        public string CONNECTION_START_TIME;
        public string CONNECTION_LAST_UPDATE_TIME;
        public string CONNECTION_FLAG;
        public string CONNECTION_ID;
        public string TOTAL_EVENT_COUNT;
        public string TUNNEL_PAIR_ID;
        public string RESPONSIVENESS_TYPE;
        public string CLIENT_PORT;
        public string PAYLOAD_TYPE;
        public string VIRTUAL_TYPE;
        public string VID_CLIENT;
        public string VID_SERVER;
        public string CLIENT_ADDR;
        public string SERVER_ADDR;
        public string CLIENT_TUNNEL_ADDR;
        public string SERVER_TUNNEL_ADDR;
        public string ERROR_CODE_2;
        public string IPID;
        public string C2S_PKTS;
        public string C2S_OCTETS;
        public string S2C_PKTS;
        public string S2C_OCTETS;
        public string NUM_SUCC_TRANS;
        public string CONNECT_TIME;
        public string TOTAL_RESP;
        public string TIMEOUTS;
        public string RETRIES;
        public string RAI;
        public string TCP_SYNS;
        public string TCP_SYN_ACKS;
        public string TCP_SYN_RESETS;
        public string TCP_SYN_FINS;
        public string EVENT_TYPE;
        public string FLAGS;
        public string TIME_STAMP;
        public string EVENT_ID;
        public string EVENT_CODE;
              

    }

}

I hope someone can give me a solution. Thanks :)