private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
if (e.RowIndex >= 0 && ((DataGridView)sender).Columns[e.ColumnIndex].GetType() == typeof(DataGridViewButtonColumn))
{
DataGridViewRow row = (DataGridViewRow)dataGridView1.Rows[0].Clone();
dataGridView1.Rows.Add(row);
}
}