SerialPort.IsOpen Property

Note: This property is new in the .NET Framework version 2.0.

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 */
public boolean get_IsOpen ()

public function get IsOpen () : boolean

Property Value

true if the serial port is open; otherwise, false. The default is false.

Exception typeCondition


The IsOpen value passed is a null reference (Nothing in Visual Basic).


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

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0

.NET Compact Framework

Supported in: 2.0