Подскажите пожалуйста как произвести экспорт данных в Excel из DataGridView через DataTable.

Вот структура. Как использовать вместо DataGridView DataTable.

namespace V2
{
public partial class _2VER : Form
{
public _2VER()
{
InitializeComponent();
}
OleDbConnection conn = new OleDbConnection();
OleDbCommand comm = new OleDbCommand();
OleDbDataAdapter ad = new OleDbDataAdapter();
BindingSource bs = new BindingSource();
DataTable dt = new DataTable();

private void _2VER_Load(object sender, EventArgs e)
{
conn.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\Прочие документы\Учеба 2014\Управление проектами\V2\ПРАКТИКА2.accdb";
comm=conn.CreateCommand();
comm.CommandText = "select * from ПК";
ad.SelectCommand = comm;
ad.Fill(dt);
dataGridView1.DataSource = dt;
}

private void button1_Click(object sender, EventArgs e)
{
Excel2.Application app = new Excel2.Application();
app.SheetsInNewWorkbook = 2;
app.Workbooks.Add();
app.Visible = true;
Excel2.Workbook book = app.Workbooks[1];
Excel2.Worksheet sheet2 = book.Worksheets[2];
for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
{
sheet2.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
}
for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
{
for (int j = 0; j < dataGridView1.Columns.Count; j++)
{
sheet2.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value.ToString();
}
}
sheet.Activate();
}
}
}