Format Excel through Visual Studio C#

1)how do i start the database on line A2 of the Excel Spreadsheet?
2)How do i add column names for the data?

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.Data.SqlClient;
using Excel = Microsoft.Office.Interop.Excel;

namespace Final
{
    public partial class Excel2 : Form
    {
        public Excel2()
        {
          InitializeComponent(); 
        }
 

            Excel.Application xlApp;
            Excel.Workbook xlWorkBook;
            Excel.Worksheet xlWorkSheet;
            object misvalue = System.Reflection.Missing.Value;


        private void Excel2_Load(object sender, EventArgs e)
        {
            Global.Dta = new SqlDataAdapter("SELECT Orders.OrderID, Customers.CompanyName, Customers.ContactName, Customers.Region, Orders.OrderDate, Orders.ShippedDate, Orders.Freight FROM Customers INNER JOIN Orders ON Customers.CustomerID = Orders.CustomerID", Global.Con);
            Global.dts = new DataSet();
            Global.Dta.Fill(Global.dts);
            dgvEmployee.DataSource = Global.dts.Tables[0];
        }

        private void btnExcel_Click(object sender, EventArgs e)
        {
            Excel.Range chart;
            xlApp = new Excel.Application();
            xlWorkBook = xlApp.Workbooks.Add(misvalue);
            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

            xlWorkSheet.get_Range("A1", "D1").Merge(false);
            chart = xlWorkSheet.get_Range("A1", "A4");
            chart.FormulaR1C1 = "ORDER";
            chart.HorizontalAlignment = 3;
            chart.VerticalAlignment = 3;

            for (int i = 0; i <= Global.dts.Tables[0].Rows.Count - 1; i++)
            {
                for (int j = 0; j <= Global.dts.Tables[0].Columns.Count - 1; j++)
                {
                    String data = Global.dts.Tables[0].Rows[i].ItemArray[j].ToString();
                    xlWorkSheet.Cells[i + 1, j + 1] = data;
                }
            }

            xlWorkBook.SaveAs("csharp.net-informations.xls", Excel.XlFileFormat.xlWorkbookNormal, misvalue, misvalue, misvalue, misvalue, Excel.XlSaveAsAccessMode.xlExclusive, misvalue, misvalue, misvalue, misvalue, misvalue);
            xlWorkBook.Close(true,misvalue,misvalue);
            xlApp.Quit();

            MessageBox.Show("Excel created");

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlApp);
        }

        private void releaseObject(object obj)
        {
            try
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
                obj = null;
            }
            catch (Exception ex)
            {
                obj = null;
                MessageBox.Show("Exception Occured while releasing object " + ex.ToString());
            }
            finally
            {
                GC.Collect();
            }
        }
    }
}