private void btnStop_Click(object sender, EventArgs e) { cntrl.StopProcess(); richTextBox1.Text = " RTU Emulator Has been Stopped"; richTextBox1.Font = new Font(richTextBox1.Font, FontStyle.Bold); richTextBox1.BackColor = Color.Red; richTextBox1.ForeColor = Color.White; btnasync.Enabled = true; btnStop.Enabled = false; sb.Clear(); }