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CtsHolding Property

SerialPort.CtsHolding Property

Gets the state of the Clear-to-Send line.

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

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

Property Value

Type: System.Boolean
true if the Clear-to-Send line is detected; otherwise, false.

ExceptionCondition
IOException

The port is in an invalid state.

- or -

An attempt to set the state of the underlying port failed. For example, the parameters passed from this SerialPort object were invalid.

InvalidOperationException

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

The Clear-to-Send (CTS) line is used in Request to Send/Clear to Send (RTS/CTS) hardware handshaking. The CTS line is queried by a port before data is sent.

.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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