Debug.WriteLine Method (String)

Writes a specified message followed by a line terminator to the debugger by using the OutputDebugString function.

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


<ConditionalAttribute("DEBUG")> _
Public Shared Sub WriteLine ( _
    message As String _
public static void WriteLine(
    string message


  • message
    Type: System.String
    The message to write to the debugger.


By default, the output is written to the debugger.


The WriteLine method behaves differently in Silverlight-based applications than it does in desktop applications. There is no Listeners collection to specify the destination for debug output. In Windows, the .NET Framework for Silverlight sends debugging information to the OutputDebugString function and to the debugger, if one is attached. The Visual Studio debugger displays the information in the Output window. If a debugger is not attached, the output from OutputDebugString can be viewed by using a debug viewer. The Apple Macintosh OS X does not have an OutputDebugString function. Therefore, managed debugging can be done only through remote debugging on a Windows computer by using a Visual Studio plug-in.

Version Information


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0


For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.