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SerialPort.BytesToWrite Property

Gets the number of bytes of data in the send buffer.

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

'Declaration
<BrowsableAttribute(False)> _
Public ReadOnly Property BytesToWrite As Integer

Property Value

Type: System.Int32
The number of bytes of data in the send buffer.

ExceptionCondition
IOException

The port is in an invalid state.

InvalidOperationException

The stream is closed. This can occur because the Open method has not been called or the Close method has been called.

The send buffer includes the serial driver's send buffer as well as internal buffering in the SerialPort object itself.

.NET Framework

Supported in: 4.5.3, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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