private void Btn_submit_Click(object sender, EventArgs e) { var temp_desk = new Desk() { width = Convert.ToInt32(deskWidth.Value), depth = Convert.ToInt32(deskDepth.Value), numberOfDrawer = (int)numDrawers.Value, desktop = (Material)MaterialsCombo.SelectedValue }; var deskQuote = new DeskQuote { desk = temp_desk, customerName = txtcustomerName.Text, quoteDate = DateTime.Now, shipping = (Shipping)comShipping.SelectedValue, quotePrice = 0 }; deskQuote.setPrice(); var quotesFile = @"quotes.json"; List <DeskQuote> deskquotes = new List <DeskQuote>(); //read existing quotes if any if (File.Exists(quotesFile)) { using (StreamReader reader = new StreamReader(quotesFile)) { //load existing quotes string quotes = reader.ReadToEnd(); if (quotes.Length > 0) { // deserialization time! deskquotes = JsonConvert.DeserializeObject <List <DeskQuote> >(File.ReadAllText(quotesFile)) ?? new List <DeskQuote>(); } } } deskquotes.Add(deskQuote); string jsonDesks = JsonConvert.SerializeObject(deskquotes); File.WriteAllText(quotesFile, jsonDesks); //var newQuoteString = deskquotes[2]; //MessageBox.Show(newQuoteString); DisplayQuote displayQuote = new DisplayQuote(deskQuote); displayQuote.Show(); }