How to use text to columns in C#?

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 Microsoft.Office.Interop.Excel;
using System.IO;

namespace ProcessExcelFile
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string _filename = @"E:\Import File\Working\20_04_2015_21_00_57_B14.csv";
            StreamReader ObjStreamReader = new StreamReader(File.OpenRead(_filename));
            string[] line = ObjStreamReader.ReadLine().Split(';');
            string[] machinename = _filename.Split('_');
            for (int i = 2; i < line.Length; i++)
            {
                line[i] = string.Concat(line[i].Trim('"'), "_" ,machinename[machinename.Length - 1].Remove(machinename[machinename.Length - 1].IndexOf(".csv")));
            }
            
            List<System.Collections.Generic.List<string>> ObjListColumns = new List<List<string>>();
            //here 
            for (int i = 1; i < line.Length; i++)
            {
                ObjListColumns.Add(new List<string>());
            }

            string[] values = null;
            while (!ObjStreamReader.EndOfStream)
            {
                values = null;
                values = ObjStreamReader.ReadLine().Split(';');
                for (int i = 0; i < ObjListColumns.Count; i++)
                {
                    ObjListColumns[i].Add(values[i + 1]);
                }
            }
            ObjStreamReader.Close();

            for (int i = 0; i < ObjListColumns[0].Count; i++)
            {
                ObjListColumns[0][i] = ObjListColumns[0][i].Trim('"').Trim('\\').Trim('"');
            }
            for (int i = 0; i < ObjListColumns.Count; i++)
            {
                for (int j = 0; j < ObjListColumns[i].Count; j++)
                {
                    ObjListColumns[i][j] = ObjListColumns[i][j].Trim('"');
                }
            }
            FileStream ObjFileStream = new FileStream(@"E:\Import File\Working\abc1.csv", FileMode.OpenOrCreate);
            StreamWriter ObjWriter = new StreamWriter(ObjFileStream);

            string text=null;
            ObjWriter.WriteLine("[Data]");
            ObjWriter.WriteLine("Tagname;TimeStamp;Value;DataQuality");

            for (int i = 2; i < line.Length; i++)
            {
                
                for (int j = 0; j < ObjListColumns[i-1].Count; j++)
                {

                    text=null;
                    text=line[i].ToString()+";"+ObjListColumns[0][j].ToString()+";"+ObjListColumns[i - 1][j].ToString()+";"+"Good";
                    ObjWriter.WriteLine(text);

                }
            }
            ObjWriter.Close();

            DateTime endtime = DateTime.Now;
            MessageBox.Show("Compeleted in ");

        }
    }
}