remplire des textbox à partir d'un fichier.txt

 private void button1_Click(object sender, EventArgs e)
        {
           Service1Client proxy = new Service1Client();
           Commande cmd = new Commande();
           cmd.ID = textBox1.Text;
           cmd.DateCommande=dateTimePicker1.Value;
          
           try
           {
               cmd.MedCommandee = new Medicament[dataGridView1.Rows.Count];
               for (int i = 0; i < dataGridView1.Rows.Count-1; i++)
               {
                   cmd.MedCommandee[i] = new Medicament();
                   cmd.MedCommandee[i].ID = dataGridView1.Rows[i].Cells[0].Value.ToString();
                   cmd.MedCommandee[i].CodeBarre = dataGridView1.Rows[i].Cells[1].Value.ToString();
                   cmd.MedCommandee[i].Designation = dataGridView1.Rows[i].Cells[2].Value.ToString();
                   cmd.MedCommandee[i].PrixVente = Convert.ToDouble(dataGridView1.Rows[i].Cells[3].Value.ToString());
                   cmd.MedCommandee[i].Quantite = Convert.ToInt32(dataGridView1.Rows[i].Cells[4].Value.ToString());                
               }
           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message);
           }
           

           cmd.nbr_Lignes_Commande =Convert.ToInt32 (textBox3.Text);
           cmd.nbr_Produits_Commande =Convert.ToInt32( textBox4.Text);
           //cmd.pharmacien.AdressPharmacien = textBox6.Text;
           cmd.pharmacien = new Pharmacien();
           cmd.pharmacien.CodePharmacien =textBox10.Text;
           //cmd.pharmacien.ID = textBox9.Text;
           cmd.pharmacien.NomPharmacien = textBox8.Text;
           //cmd.pharmacien.TelephonePharmacien =Convert.ToInt32( textBox7.Text);
           
           string resultat = proxy.EnvoyerCommande(cmd);
           if (resultat=="1")
           {
               MessageBox.Show("Opération reussie");

           }
           else
           {
               MessageBox.Show("Opération non reussie");
           }
        }