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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.debug.writeline below:

Debug.WriteLine Method (System.Diagnostics) | Microsoft Learn

Source:: Debug.cs

Source:: Debug.cs

Source:: Debug.cs

Source:: Debug.cs

Writes a category name and the value of the object's ToString() method to the trace listeners in the Listeners collection.

public:
 static void WriteLine(System::Object ^ value, System::String ^ category);

[System.Diagnostics.Conditional("DEBUG")]
public static void WriteLine(object value, string category);

[System.Diagnostics.Conditional("DEBUG")]
public static void WriteLine(object? value, string? category);

[<System.Diagnostics.Conditional("DEBUG")>]
static member WriteLine : obj * string -> unit

Public Shared Sub WriteLine (value As Object, category As String)

Parameters

category: String

A category name used to organize the output.

Attributes

Examples

The following example creates a TraceSwitch named generalSwitch. This switch is set outside of 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.
static TraceSwitch generalSwitch = new TraceSwitch("General", "Entire Application");

static public void MyErrorMethod(Object myObject, string category)
{
    // Write the message if the TraceSwitch level is set to Error or higher.
    if (generalSwitch.TraceError)
        Debug.Write("Invalid object for category. ");

    // Write a second message if the TraceSwitch level is set to Verbose.
    if (generalSwitch.TraceVerbose)
        Debug.WriteLine(myObject, category);
}

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


Public Shared Sub MyErrorMethod(myObject As Object, category As String)
    ' Write the message if the TraceSwitch level is set to Error or higher.
    If generalSwitch.TraceError Then
        Debug.Write("Invalid object for category. ")
    End If 
    ' Write a second message if the TraceSwitch level is set to Verbose.
    If generalSwitch.TraceVerbose Then
        Debug.WriteLine(myObject, category)
    End If
End Sub

Remarks

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

The category parameter can be used to group output messages.

This method calls the WriteLine method of the trace listener.