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SerialPort.IsOpen Property

Gets a value indicating the open or closed status of the SerialPort object.

Namespace:  System.IO.Ports
Assembly:  System (in System.dll)

public bool IsOpen { get; }

Property Value

Type: System.Boolean
true if the serial port is open; otherwise, false. The default is false.


The IsOpen value passed is null.


The IsOpen value passed is an empty string ("").

The IsOpen property tracks whether the port is open for use by the caller, not whether the port is open by any application on the machine.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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