<form enctype="multipart/form-data" method="post" action="<?php echo base_url(); ?>eregistration/uploadExcelFile" role="form">
    <div class="form-group">
        <label for="exampleInputFile">File Upload</label>
        <input type="file" name="file" id="file" size="150">
        <p class="help-block">Only Excel/CSV File Import.</p>
    </div>
    <button type="submit" class="btn btn-default" name="Import" value="Import">Upload</button>
</form>