Hierarchical Data Into DataGridView in C#

myDataGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect; 

using System.Windows.Forms;
using System.Drawing;
using System.Data;

namespace DataGridView
{
public partial class Form1 : Form
{
private System.Data.DataSet dataSet;
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
myDataGridView.Columns.Add("myColumn1", "Roll Number");
myDataGridView.Columns.Add("myColumn2", "Course");
myDataGridView.Columns.Add("myColumn3", "Subject");
myDataGridView.Columns.Add("myColumn4", "Marks(Out of 100)");

myDataGridView.Columns[2].DefaultCellStyle.WrapMode = DataGridViewTriState.True;
myDataGridView.Columns[3].DefaultCellStyle.WrapMode = DataGridViewTriState.True;

myDataGridView.Rows.Add(new object[] { 1, "Course 1","Sub 1\nSub 2\nSub3", "90\n95\n85" });
myDataGridView.Rows.Add(new object[] { 2, "Course 2", "Sub 1\nSub 2\nSub3", "67\n57\n84" });
myDataGridView.Rows.Add(new object[] { 3, "Course 3", "Sub 1\nSub 2\nSub3", "64\n80\n92" });
myDataGridView.Rows.Add(new object[] { 4, "Course 4", "Sub 1\nSub 2\nSub3", "94\n90\n99" });
myDataGridView.Rows.Add(new object[] { 5, "Course 5", "Sub 1\nSub 2\nSub3", "45\n58\n97" });

myDataGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
}

private void myDataGridView_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
if (e.ColumnIndex == 2 || e.ColumnIndex ==3)
{
e.CellStyle.SelectionBackColor=Color.White;
e.CellStyle.SelectionForeColor = Color.Black;
}
}
}
}