Gets the state of the Carrier Detect line for the port.
Assembly: System (in System.dll)
The port is in an invalid state.
- or -
An attempt to set the state of the underlying port failed. For example, the parameters passed from this SerialPort object were invalid.
This property can be used to monitor the state of the carrier detection line for a port. No carrier usually indicates that the receiver has hung up and the carrier has been dropped.
Available since 2.0