<form action="/Etalon/Filter" class="form-horizontal" enctype="multipart/form-data" id="extendedFilter" method="post" name="extendedFilter">                        <div class="form-group">
                            <label for="ID_Base" class="col-sm-3 control-label">Выберите базу:</label>
                            <div class="col-sm-9">
                            </div>
                        </div>
                        <div class="form-group">
<div id="btnAttachFile">
    <div class="col-sm-3" style="text-align:right;">
        <button class="btn btn-primary btn-sm" type="button" onclick="">Выбрать файл</button>
    </div>
    <div class="col-sm-9">
        <input type="file" name="files" style="display:none;">
        <input type="text" id="attachFile" class="form-control" readonly="">
    </div>
</div>
                        </div>
</form>