What is the most efficient way to save a byte array as a file on disk in C#?

Question

Pretty simple scenario. I have a web service that receives a byte array that is to be saved as a particular file type on disk. What is the most efficient way to do this in C#?

Answer 1

And WriteAllBytes just performs

using (FileStream stream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read))
{
    stream.Write(bytes, 0, bytes.Length);
}

BinaryWriter has a misleading name, it's intended for writing primitives as a byte representations instead of writing binary data. All its Write(byte[]) method does is perform Write() on the stream its using, in this case a FileStream.