Need a sample code on how to use the excel autofit in c# pls help

Thanks sir Ramalinga, but where in the program could I put that code? Here's the complete program code below, just guide me a little sir. thank you and God bless
===================================

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 Excel = Microsoft.Office.Interop.Excel;

namespace IROCtrans
{
public partial class frmIroc : Form
{
public frmIroc()
{
InitializeComponent();
}

//-----------------
// Excel object references.
private Excel.Application m_objExcel = null;
private Excel.Workbooks m_objBooks = null;
private Excel._Workbook m_objBook = null;
private Excel.Sheets m_objSheets = null;
private Excel._Worksheet m_objSheet = null;
private Excel.Range m_objRange = null;
private Excel.Font m_objFont = null;
private Excel.QueryTables m_objQryTables = null;
private Excel._QueryTable m_objQryTable = null;

//- ----------------

// Frequenty-used variable for optional arguments.
private object m_objOpt = System.Reflection.Missing.Value;

// Paths used by the sample code for accessing and storing data.
private object m_strSampleFolder = "D:\\Sonix\\TryCode\\";

private void frmIroc_Load(object sender, EventArgs e)
{
cmbSelect.DropDownStyle = ComboBoxStyle.DropDownList;
cmbSelect.Items.AddRange(new object[]{
"Convert Text File to Excel File",
"Exit"});
cmbSelect.SelectedIndex = 0;
cmdConvert.Text = "&Access";
}

private void cmdConvert_Click(object sender, EventArgs e)
{
switch (cmbSelect.SelectedIndex)
{
case 0:
Convert_TextFile();
break;
case 1:
Exit_Application();
break;
}

//Clean-up
m_objFont = null;
m_objRange = null;
m_objSheet = null;
m_objSheets = null;
m_objBooks = null;
m_objBook = null;
m_objExcel = null;
GC.Collect();
}
private void Exit_Application()
{
cmdConvert.Text = "";
cmdConvert.Text = "Exiting...";
System.Threading.Thread.Sleep(3000);

this.Close();
}

private void Convert_TextFile()
{
// Open the text file in Excel.
m_objExcel = new Excel.Application();
m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
m_objBooks.OpenText(m_strSampleFolder + "test-data.csv",
Excel.XlPlatform.xlWindows, 1,
Excel.XlTextParsingType.xlDelimited,
Excel.XlTextQualifier.xlTextQualifierDoubleQuote,
false, true, false, false, false, false, m_objOpt, m_objOpt,
m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt);

m_objBook = m_objExcel.ActiveWorkbook;

// Save the text file in the typical workbook format and quit Excel.
m_objBook.SaveAs(m_strSampleFolder + "test-data.xls",
Excel.XlFileFormat.xlWorkbookNormal,
m_objOpt, m_objOpt, m_objOpt, m_objOpt,
Excel.XlSaveAsAccessMode.xlNoChange,
m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt);

m_objBook.Close(false, m_objOpt, m_objOpt);
m_objExcel.Quit();


Excel.Range xlEntireColumn = null;
Excel.Range xlRange = null;

}
}
}