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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)

[BrowsableAttribute(false)]
public bool IsOpen { get; }

Property Value

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

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, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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