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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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