OleDbConnection conn = new OleDbConnection(constring);
            try
            {
                conn.Open();
                OleDbCommand cmd = new OleDbCommand("INSERT INTO Clienti(ID,Nome,Cognome,[Data Nascita],Indirizzo,Citta,Cap,Piva,CodFiscale,Dominio) VALUES ("+'1' + ',' + textBox1.Text + ',' + textBox2.Text + ','+ textBox3.Text + ','+ textBox4.Text+ ',' + textBox5.Text + ',' + textBox6.Text +',' +textBox7.Text + ',' + textBox8.Text+ ',' + textBox9.Text + ')',conn);
                cmd.ExecuteNonQuery();
                conn.Close();
            }
            catch (OleDbException ex)
            {
                MessageBox.Show(ex.ToString());
            }