private void button1_Click(object sender, EventArgs e) { if (dataGridView1.SelectedRows.Count > 0) { if ( MessageBox.Show ( "Do you really want to delete this product(s) ?", "warning", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes ) { for (int i = 0; i < dataGridView1.SelectedRows.Count; i++) { etudiantBLO.DeleteProduct(dataGridView1.SelectedRows[i].DataBoundItem as Etudiant); } loadData(); } } }