private async void buttonNewVersion_Click(object sender, EventArgs e) { try { Client cl = listBoxClients.SelectedItem as Client; if (cl == null) { MessageBox.Show("Пожалуйста выберите пользователя"); } else { await cl.NewVersion(richTextBox1.Text); if (cl.isSuccefullUpdate) { richTextBox1.Text = "Success"; this.Invalidate(); } else { richTextBox1.Text = "Fail "; richTextBox1.AppendText(cl.exeptionString); } } } catch (Exception ex) { MessageBox.Show(ex.Message); } }