I have to view file in iframe canot add this. Can any one help to slove this

code

    <div class="modal-content" id="modalcontentWidthSet">
        <div class="show_documentmodal_header">
            @*<h5 class="modal-title" id="ModalTitle">Add Titel</h5>*@
            <button type="button" class="close" data-dismiss="modal" aria-label="Close" title="Close" style="text-align:left">
                <span aria-hidden="true">&times;</span>
            </button>
        </div>
        <div class="modal-body" id="inModalRowAutoHeightDetect">


            <div class="embed-responsive embed-responsive-21by9 h-100  d-inline-block">
                <iframe class="embed-responsive-item myIframe" id="addpdforimage" allowtransparency="true" src="" allowfullscreen></iframe>
            </div>


        </div>

    </div>
</div>