I am using Franson Serial Port for communication via GSM modem.
I have created some thread to use this port, and i check the use of port via Mutex and I have controled it, but i face this error many times.
A managed NullRefrenceException Occured at Port::DoEvent+0X22
Port::Doevent + 0x22
Port::m_dispatch_func + 2x97</font id="red">
Thank you in advance for any kind attention