Validate Upload control in Kendo UI

//This is kendo ui upload property class with Required validation attribute.

public class Upload

{

    [Required(ErrorMessage = "Please select files for upload.")]

    public HttpPostedFileBase file { get; set; }

}

//This is upload file control with kendo ui mvc 5.

<div id="IsValid">

@using (Html.BeginForm("Upload", "UploadController", FormMethod.Post, new { id = "UploadId", enctype = "multipart/form-data"}))

{

        @(Html.Kendo().Upload()

            .Name("files")

            .Multiple(false)

            .HtmlAttributes(new { required = true })

        )        

        @Html.ValidationMessageFor(m => m.file)

        <button class="k-button" id="btnUpload" type="submit">Submit</button>

}

</div>

//This is javascript code for validate Kendo().Upload() controle.

<script type="text/javascript">

    $(document).ready(function () {

        var isVaid = $("#IsValid").kendoValidator().data("kendoValidator");

        $("#btnUpload").click(function (e) {

            if ($("#files").parent().siblings("ul").length > 0) {

                $("#files").removeAttr("required");

            }

            if (!isVaid.validate()) {

                e.preventDefault();

            }

        });

    });

</script>