for (int i = 0; i < dataGridView1.RowCount; i++)
            {
                if (dataGridView1.Rows[i].Cells["id"].Value.ToString() != "")
                {
                    // if (dataGridView1.Rows[i].Cells[7].Value.ToString() == "1" && dataGridView1.Rows[i].Cells[8].Value.ToString() == "1")
                    //    indisponibile++;   Serve per verificare se ci sono dei prodotti non presenti in magazzino
                    importo = System.Convert.ToDecimal(dataGridView1.Rows[i].Cells["quantita"].Value.ToString()) * System.Convert.ToDecimal(dataGridView1.Rows[i].Cells["prezzo"].Value.ToString()) * (1 - (System.Convert.ToDecimal(dataGridView1.Rows[i].Cells["sconto"].Value.ToString())) / 100);
                    //dataGridView1.Rows[i].Cells["importo"].Value = importo.ToString();
                    importotot += importo;
                    tmpIVA = importo - (importo * (1 - (System.Convert.ToDecimal(dataGridView1.Rows[i].Cells["iva"].Value.ToString())) / 100));
                    ivatot += tmpIVA;
                    if (System.Convert.ToBoolean(dataGridView1.Rows[i].Cells["Differita"].Value))
                        ivaconto += tmpIVA;
                }
            }