c# lock function during async file write [duplicate]

I have an async write but I want to make sure if the method is called again while a write is still underway, it waits until the file is ready before trying the next attempt.

I want this all to be non blocking.

Is this the correct way to do it?

Do i even need the lock? Or does the streamwriter already look after this.

lock (fileWriterLock) { FileWriteAsync(filename, data); } 

and then..

 public async Task FileWriteAsync(string filePath, string messaage) { using (FileStream stream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None, 4096, true)) using (StreamWriter sw = new StreamWriter(stream)) { await sw.WriteLineAsync(messaage); } }