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Trace.WriteLine Method (String)

Writes a message to the trace listeners in the Listeners collection.

Namespace:  System.Diagnostics
Assembly:  System (in System.dll)

<ConditionalAttribute("TRACE")> _
Public Shared Sub WriteLine ( _
	message As String _


Type: System.String
A message to write.

By default, the output is written to an instance of DefaultTraceListener.

This method calls the WriteLine method of the trace listener.

The following example creates a TraceSwitch named generalSwitch. This switch is set outside the code sample.

If the switch is set to the TraceLevel Error or higher, the example outputs the first error message to the Listeners. For information on adding a listener to the Listeners collection, see the TraceListenerCollection class.

Then, if the TraceLevel is set to Verbose, the example outputs the second error message on the same line as the first message. The second message is followed by a line terminator.

    ' Class-level declaration.
    ' Create a TraceSwitch.
    Private Shared generalSwitch As New TraceSwitch("General", "Entire Application")    

    Public Shared Sub MyErrorMethod()
        ' Write the message if the TraceSwitch level is set to Error or higher.
        If generalSwitch.TraceError Then
            Trace.Write("My error message. ")
        End If 
        ' Write a second message if the TraceSwitch level is set to Verbose.
        If generalSwitch.TraceVerbose Then
            Trace.WriteLine("My second error message.")
        End If
    End Sub

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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