JQuery ajax file upload to ASP.NET

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ASP.NET

Ajax

jQuery

Hi,
I am building a website, that has a career page with Input File HTML Control for Resume uploading.
While using JQuery to POST the form values to an ASPX Page, Everything works fine except File uploading.
How can I Use JQuery to Post every fields (including files) in one AJAX request ?
The example I see in Google are handling only the file uploading, not other fields with it.
This is my JQuery, ASPX for file upload not made.

<script type="text/javascript">

       $(document).ready(function(e) {
 
           // File variable
           var files;

           // Add events
           $('#resume').on('change', prepareUpload);

           // Grab the files and set them to our variable
           function prepareUpload(event)
           {
             files = event.target.files;
           }



       $( "#submit_btn" ).click(function( ) {
         
           var fileData = new FormData();
           $.each(files, function(key, value)
           {
               fileData.append(key, value);
           });



           var formMessage = tinyMCE.get('message').getContent();
           var formName = $('.contact-container #name').val();
           var formPhone = $('.contact-container #phone').val();
           var formEmail = $('.contact-container #email').val();
           var formApplyFor = $('.contact-container #applyfor').val();

        // Get some values from elements on the page:
       var a=  $.ajax({
               method: "POST",
               url: "mail/test.aspx",
               processData: false,
               contentType: false,
               data: {
                       form: 'career',
                       name: formName ,
                       phone: formPhone,
                       email: formEmail,
                       applyfor: formApplyFor,
                       resume: fileData,
                       coverletter: window.btoa(unescape(encodeURIComponent( formMessage)))
                       },

                       success: function (data) {
                       alert('success');

                   },
                   error: function (data) {
                       alert('err');

                   }
           })
           .done(function( msg ) {
               alert('done');
           }); //ajax end
       alert(a);

       }); //submit button end

       }); //document ready end
</script>