private void button1_Click_1(object sender, EventArgs e) { if (bw.IsBusy) { MessageBox.Show("Please wait for enumeration to complete.", "Please wait", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1); } else { if (Targets.Count > 0) { Learn learn = new Learn(Targets); learn.Show(); } else { MessageBox.Show("Please enumerate devices for at least one target", "No devices enumerated", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1); } } }