Validate FileUpload Accept Only xlsx File

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    $(function () {

            $('input:file').change(function () {
                var ext = this.value.split('.').pop();
                var FileExt = ['xlsx']
                if ($.inArray($(this).val().split('.').pop().toLowerCase(), FileExt) == -1) {

                    var xl = "Please Select xlsx Format Files"
                    alert(xl);

                    this.$find('input:file').dispose();
                    return false;
                }

            });


        });

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