What would be the fastest way to concatenate three files in C#?

Question

I need to concatenate 3 files using C#. A header file, content, and a footer file, but I want to do this as cool as it can be done.

Cool = really small code or reall

Answer 1

I would go this route...

    FileStream fStream = new FileStream("outputpath", FileMode.Append);
    foreach (string item in new string[] { "file1", "file2", "file3" })
        fStream.Write(File.ReadAllBytes(item));
    fStream.Close();

Not file size dependent, no concatenation, and avoiding any possible encoding/decoding issues by reading/writing bytes.