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SerialPort.Close Method

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

Closes the port connection, sets the IsOpen property to false, and disposes of the internal Stream object.

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

public void Close ()
public void Close ()
public function Close ()
Exception typeCondition

InvalidOperationException

The specified port is not open.

Calling this method closes the SerialPort object and clears both the receive and transmit buffers.

The best practice for any application is to wait for some amount of time after calling the Close method before attempting to call the Open method, as the port may not be closed instantly.

The following code example demonstrates the use of the SerialPort class to allow two users to chat from two separate computers connected by a null modem cable. In this example, the users are prompted for the port settings and a username before chatting. This code example is part of a larger code example provided for the SerialPort class.

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
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