private void specialButton2_Click(object sender, EventArgs e) { if (actualPanel != null) { actualPanel.Visible = false; } actualPanel = networkPanel; actualPanel.Visible = true; label2.Visible = false; List <string> adapterName = NetInfo.GetAvailableAdapterName(); comboBox1.Items.Clear(); if (adapterName != null && adapterName.Count != 0) { foreach (string name in adapterName) { comboBox1.Items.Add(name); } } else { label2.Visible = true; } }