Debug.WriteLine Method (Object)
Writes the value of a specified object's ToString method to the debugger by using the OutputDebugString function.
Assembly: System (in System.dll)
By default, the output is sent 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.