C# Append byte array to existing file

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One way would be to create a FileStream with the FileMode.Append creation mode.

Opens the file if it exists and seeks to the end of the file, or
creates a new file.

This would look something like:

public static void AppendAllBytes(string path, byte[] bytes)
{
    //argument-checking here.

    using (var stream = new FileStream(path, FileMode.Append))
    {
        stream.Write(bytes, 0, bytes.Length);
    }
}

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