Customizing Header Row of DataGridView in C#.Net

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Web.UI.WebControls;

namespace DgvColumnHeaderMerge
{
    public partial class DgvColumnHeaderMerge : Form
    {
        public event GridViewRowEventHandler RowCreated;

        public DgvColumnHeaderMerge()
        {
            InitializeComponent();
        }

        private void DgvColumnHeaderMerge_Load(object sender, EventArgs e)
        {
            DgvColumnHeaderMerge d_obj = new DgvColumnHeaderMerge();

            this.dataGridView2.Columns.Add("dept_name", "Name");

            this.dataGridView2.Columns.Add("dept_code", "Code");

            this.dataGridView2.Columns.Add("emp_name", "Name");

            this.dataGridView2.Columns.Add("emp_place", "Place");

            this.dataGridView2.Columns.Add("emp_phone", "Phone No");

            // RowCreated(dataGridView2,e);

            //dataGridView2.Rows.Add();


        }

        void dataGridView2_RowCreated(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.Header)
            {
                //Build custom header.
                GridView oGridView = (GridView)sender;

                //DataGridView oGridView = (DataGridView)sender;
                GridViewRow oGridViewRow = 
                            new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert);
                TableCell oTableCell = new TableCell();

                //Add Department
                oTableCell.Text = "Department";
                oTableCell.ColumnSpan = 2;
                oGridViewRow.Cells.Add(oTableCell);

                //Add Employee
                oTableCell = new TableCell();
                oTableCell.Text = "Employee";
                oTableCell.ColumnSpan = 3;
                oGridViewRow.Cells.Add(oTableCell);
                oGridView.Controls[0].Controls.AddAt(0, oGridViewRow);
            }
        } 
    }
}

---------------------------------------------------------------
Department |       Employee           |
---------------------------------------------------------------
Name | Code | Name | Place | Phone No |
---------------------------------------------------------------
     |      |      |       |          |
---------------------------------------------------------------
     |      |      |       |          |
---------------------------------------------------------------