public void button1_Click(object sender, EventArgs e)
        {
            List<string> RisultatoPrimo = new List<string>();
            List<string> RisultatoCristina = new List<string>();

           

            if (primo.Checked)
            {
                
                SqlConnection sqlConnection1 = new SqlConnection(@"Data Source=(LocalDB)\v12.0;AttachDbFilename= C:\Users\Giovanni Camera\Documents\Visual Studio 2015\Projects\WindowsFormsApplication7\WindowsFormsApplication7\prova.MDF; Integrated Security = True");
                SqlCommand comm = new SqlCommand("SELECT NomeRicette FROM Prova WHERE Primo = 'Y' ", sqlConnection1);
                SqlDataAdapter da = new SqlDataAdapter(comm);
                DataTable dt = new DataTable();
                try
                {
                    sqlConnection1.Open();
                    da.Fill(dt);

                   
                    foreach (DataRow row in dt.Rows)
                    {
                       RisultatoPrimo.Add(Convert.ToString(row["NomeRicette"]));

                    }

                    RisultatoRicercaRicette.Items.AddRange(RisultatoPrimo.ToArray());

                   
                    sqlConnection1.Close();
                }

                catch (Exception ex)
                {
                    textBox2.Text = ex.Message;
                    MessageBox.Show(ex.Message);
                }
            }

            if (cristina.Checked)
            {
                

                SqlConnection sqlConnection1 = new SqlConnection(@"Data Source=(LocalDB)\v12.0;AttachDbFilename= C:\Users\Giovanni Camera\Documents\Visual Studio 2015\Projects\WindowsFormsApplication7\WindowsFormsApplication7\prova.MDF; Integrated Security = True");
                SqlCommand comm = new SqlCommand("SELECT NomeRicette FROM Prova WHERE Cristina = 'Y' ", sqlConnection1);
                SqlDataAdapter da = new SqlDataAdapter(comm);
                DataTable dt = new DataTable();
                try
                {
                    sqlConnection1.Open();
                    da.Fill(dt);

                    foreach (DataRow row in dt.Rows)
                    {
                        RisultatoCristina.Add(Convert.ToString(row["NomeRicette"]));

                    }

                    RisultatoRicercaRicette.Items.AddRange(RisultatoCristina.ToArray());
                   



                    sqlConnection1.Close();
                }


                catch (Exception ex)
                {
                    textBox2.Text = ex.Message;
                    MessageBox.Show(ex.Message);
                }

               /* bool a = true;
                for (int i = 0; i < RisultatoPrimo.Count; i++)
                {
                    a = RisultatoPrimo.ElementAt(i) == RisultatoCristina.ElementAt(i);
                    
                }
               
                RisultatoRicercaRicette.Items.AddRange(a.);*/
            }             
               
        }