Actally my task is load csv file into sql server using c# so i have split it by comma my problem is that some field's data contain apostrop and i m firing insert query to load data into sql so its give error my coding like that  
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.Data.SqlClient;
namespace tool
{
    public partial class Form1 : Form
    {
        StreamReader reader;
        SqlConnection con;
        SqlCommand cmd;
        int count = 0;
        //int id=0;
        FileStream fs;
        string file = null;
        string file_path = null;
        SqlCommand sql_del = null;
    public Form1()
    {
        InitializeComponent();
    }
    private void button1_Click(object sender, EventArgs e)
    {
        OpenFileDialog file1 = new OpenFileDialog();
        file1.ShowDialog();
        textBox1.Text = file1.FileName.ToString();
        file = Path.GetFileName(textBox1.Text);
        file_path = textBox1.Text;
        fs = new FileStream(file_path, FileMode.Open, FileAccess.Read);
    }
    private void button2_Click(object sender, EventArgs e)
    {
           if (file != null )
              {
                sql_del = new SqlCommand("Delete From credit_debit1", con);
                sql_del.ExecuteNonQuery();
                reader = new StreamReader(file_path);
                string line_content = null;
                string[] items = new string[] { };
                while ((line_content = reader.ReadLine()) != null)
                {
                    if (count >=4680)
                    {
                        items = line_content.Split(',');
                        string region = items[0].Trim('"');
                        string station = items[1].Trim('"');
                        string ponumber = items[2].Trim('"');
                        string invoicenumber = items[3].Trim('"');
                        string invoicetype = items[4].Trim('"');
                        string filern = items[5].Trim('"');
                        string client = items[6].Trim('"');
                        string origin = items[7].Trim('"');
                        string destination = items[8].Trim('"');
                        string agingdate = items[9].Trim('"');
                        string activitydate = items[10].Trim('"');
                        if ((invoicenumber == "-") || (string.IsNullOrEmpty(invoicenumber)))
                        {
                           invoicenumber = "null";
                        }
                        else
                        {
                            invoicenumber = "'" + invoicenumber + "'";
                        }
                        if ((destination == "-") || (string.IsNullOrEmpty(destination)))
                        {
                            destination = "null";
                       }
                        else
                        {
                           destination = "'" + destination + "'";
                        }
                        string vendornumber = items[11].Trim('"');
                        string vendorname = items[12].Trim('"');
                        string vendorsite = items[13].Trim('"');
                        string vendorref = items[14].Trim('"');
                        string subaccount = items[15].Trim('"');
                        string osdaye = items[16].Trim('"');
                        string osaa = items[17].Trim('"');
                        string osda = items[18].Trim('"');
                        string our = items[19].Trim('"');
                        string squery = "INSERT INTO credit_debit1" +
                                      "([id],[Region],[Station],[PONumber],[InvoiceNumber],[InvoiceType],[FileRefNumber],[Client],[Origin],[Destination], " +
                                      "[AgingDate],[ActivityDate],[VendorNumber],[VendorName],[VendorSite],[VendorRef],[SubAccount],[OSDay],[OSAdvAmt],[OSDisbAmt], " +
                                      "[OverUnderRecovery] ) " +
                                      "VALUES " +
                                      "('" + count + "','" + region + "','" + station + "','" + ponumber + "'," + invoicenumber + ",'" + invoicetype + "','" + filern + "','" + client + "','" + origin + "'," + destination + "," +
                                      "'" + (string)agingdate.ToString() + "','" + (string)activitydate.ToString() + "','" + vendornumber + "',' " + vendorname + "',' " + vendorsite + "',' " + vendorref + "'," +
                                     "'" + subaccount + "','" + osdaye + "','" + osaa + "','" + osda + "','" + our + "') ";
                        cmd = new SqlCommand(squery, con);
                        cmd.CommandTimeout = 1500;
                        cmd.ExecuteNonQuery();
                    }
                    label2.Text = count.ToString();
                    Application.DoEvents();
                    count++;
                }
                MessageBox.Show("Process completed");
            }
            else
            {
                MessageBox.Show("path select");
            }
    }
    private void button3_Click(object sender, EventArgs e)
    {
        this.Close();
    }
    private void Form1_Load(object sender, EventArgs e)
    {
        con = new SqlConnection("Data Source=192.168.50.200;User ID=EGL_TEST;Password=TEST;Initial Catalog=EGL_TEST;");
        con.Open();
    }
}
}
vendername field contain data (MCCOLLISTER'S TRANSPORTATION) so how to pass this data