A int containing a non-negative port number or -1.
Type Reason ArgumentOutOfRangeException The value specified for a set operation was less than zero.
The port number defines the protocol port for contacting the host referenced in the URI. If a port is not specified as part of the URI, the Uri.Port property returns the value of -1 to indicate that the default port value for the protocol scheme will be used to connect to the host. If the Uri.Port property is set to a value of -1, this indicates that the default port value for the protocol scheme will be used to connect to the host.