Upload problem in submit

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MVC5

hello every body i have used bootstrap wizard in my project with html form and inside it i used mvc Html.BeginForm and i post data and works fine there is no any problem except when i add apart of multi uploader i always get it null files but post the other data is OK when i remove html form tag it upload works but the wizard stopped this is my trial if there any suggestion

What I have tried:

<div class="tabbable-line tabbable-full-width" id="form_wizard_1">


<form class="form-horizontal" action="#" id="submit_form" method="POST">


    <div class="tab-content">

        <div class="alert alert-danger display-none">
            <button class="close" data-dismiss="alert"></button> text
        </div>



        <div class="row profile-account">

            <div class="col-md-3">


                        <ul class="ver-inline-menu tabbable margin-bottom-10">
                            <li class="active">
                                <a data-toggle="tab" href="#tab1">
                                    class="fa fa-cog" style="padding: 0" id="tab1"> back
            </a>
            <a href="javascript:;" class="btn btn-outline blue button-next">
                go on
                ^__i class="fa fa-angle-right">
            </a>
            <button type="submit" class="btn blue button-submit">
                save
                ^__i class="fa fa-check">
            </button>
    
        </div>
    </div>
</div>