Handle events

//
// Event handler by example of CTS signal event handler
//
private void ftspcControl1_OnCts(object Sender)
{
	try
	{
		if (ftspcControl1.Cts) 
		{

			// Todo: add your code
       
		}
	}
	catch (FTSPCException E)
	{
		MessageBox.Show("Error " + E.ErrorCode.ToString() + "\r\n" + 
		E.ErrorSource, "Error", MessageBoxButtons.OK,
		MessageBoxIcon.Error);
	}

}

Serial Port Control API