엑셀 내보내기 , Exporting DataGridview To Excel

References : 

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 MySql.Data.MySqlClient;
using System.Configuration;
using System.IO;

Function for exporting to Excel :

private void ToCsV(DataGridView dGV, string filename)
{
	string stOutput = "";
	// Export titles:
	string sHeaders = "";

	for (int j = 0; j < dGV.Columns.Count; j++)
	sHeaders = sHeaders.ToString() + Convert.ToString(dGV.Columns[j].HeaderText) + "\t";
	stOutput += sHeaders + "\r\n";
	// Export data.
	for (int i = 0; i < dGV.RowCount - 1; i++)
	{
		string stLine = "";
		for (int j = 0; j < dGV.Rows[i].Cells.Count; j++)
		stLine = stLine.ToString() + Convert.ToString(dGV.Rows[i].Cells[j].Value) + "\t";
		stOutput += stLine + "\r\n";
	}
	Encoding utf16 = Encoding.GetEncoding(1254);
	byte[] output = utf16.GetBytes(stOutput);
	FileStream fs = new FileStream(filename, FileMode.Create);
	BinaryWriter bw = new BinaryWriter(fs);
	bw.Write(output, 0, output.Length); //write the encoded file
	bw.Flush();
	bw.Close();
	fs.Close();
}  

Code for button for exporting to Excel : 

SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "Excel Documents (*.xls)|*.xls";
sfd.FileName = "export.xls";
if (sfd.ShowDialog() == DialogResult.OK)
{
	//ToCsV(dataGridView1, @"c:\export.xls");
	ToCsV(dataGridView1, sfd.FileName); // Here dataGridview1 is your grid view name 
}

참고 Url : http://www.codeproject.com/Tips/545456/Exporting-DataGridview-To-Excel