Convert input type = file to array of bytes - Javascript

Is it possible convert input type = file in HTML 5 to array of bytes in Javascript? I read a few articles about that but the solutions provided don't work for me. I tried these: Getting byte array through input type = file, Return the Array of Bytes from FileReader().

I need it for my ajax post method. In ASP.NET MVC app I have ViewModel with field type of byte[] and I want to write this array to database.

Code in question:

<input type="file" id="Receipt" />                           

POST method:

$(function () {
            $("#btnregister").click(function () {     
                $.ajax(
                {
                    type: "POST",
                    url: "AddUser",
                    data: 
                        {
                            File: (?)
                        }
                });
            });
        });

Thanks for any help.