var previewContainer = $(".dropzone");

   previewContainer.sortable({
                update: function(event, ui) {
                    updateMainImage();
                }
            });
 
            function updateMainImage() {
                previewContainer.children().removeClass("main-image");
                previewContainer.children().first().addClass("main-image");
            }


 myDropzone.on('sendingmultiple', function (file, xhr, formData) {
    formData.append("ilanEkle", "ilanEkle");
   $("#ResimForm").find("input").each(function(){
      formData.append($(this).attr("name"), $(this).val());
  });
});