private void ListBox1_DoubleClick(object sender, EventArgs e) { if (listBox1.SelectedItem == null) { return; } else { EmailHelper.EmailConfig ec = JsonConvert.DeserializeObject <EmailHelper.EmailConfig>(listBox1.SelectedItem.ToString()); AddEmail ae = new AddEmail(ec); ae.ShowDialog(); list = EmailHelper.EmailHelper.GetConfigsFormConfig(); listBox1.Items.Clear(); foreach (var eeec in list) { listBox1.Items.Add(eeec.ToString()); } } }