System.Diagnostics.TraceInternal.WriteLine C# (CSharp) Method

        public static void WriteLine(object value)
        {
            if (UseGlobalLock)
            {
                lock (critSec)
                {
                    foreach (TraceListener listener in Listeners)
                    {
                        listener.WriteLine(value);
                        if (AutoFlush) listener.Flush();
                    }
                }
            }
            else
            {
                foreach (TraceListener listener in Listeners)
                {
                    if (!listener.IsThreadSafe)
                    {
                        lock (listener)
                        {
                            listener.WriteLine(value);
                            if (AutoFlush) listener.Flush();
                        }
                    }
                    else
                    {
                        listener.WriteLine(value);
                        if (AutoFlush) listener.Flush();
                    }
                }
            }
        }

 public static void WriteLine(object value, string category)
 {
     TraceInternal.WriteLine(value, category);
 }