Using TextWriter.Synchronized or having lock in multithreaded file IO - C# WPF .net 4.5

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C#

WPF

multi-threading

C#5.0

IO

Ok there are 2 ways of writing text to a file in multi threaded system

Which one is better than other

First case : having a static object to lock streamwriter and do operations

Second case having

TextWriter twWaitingToBeFetched;
twWaitingToBeFetched = TextWriter.Synchronized(new StreamWriter(stringPath, true));
twWaitingToBeFetched.WriteLine(srNewComposedUrl);
twWaitingToBeFetched.Flush();

Now which one is better do you think and why ?

I need multiple threads tasks to write same stream

C# .net 4.5 - WPF application