My xamarin app shows my code in release mode

问题

I'm a beginner in Xamarin and I just create a simple android app in Xamarin by preprocessed razor template.

But after debugging or after releasing and installing the app on my phone, if I tap on the screen a white page it showed, and in another phone my code were shown on the phone.

What can I do to solve this problem? This is my code:

<div class="row" style="padding:5px">
        <nav class="navbar navbar-inverse">
            <div class="container">
                <div class="navbar-header">

                    <a href="file:///android_asset/Ethicshtml.cshtml" class="navbar-brand">Home</a>
                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#mainNavBar">
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                    </button>

                </div>
                <ul class="collapse nav navbar-nav" id="mainNavBar">
                    <li><a href="file:///android_asset/Professional.cshtml">Profesional</a></li>
                    <li><a href="file:///android_asset/Moral.cshtml">Moral</a></li>
                    <li><a href="file:///android_asset/Security.cshtml">Security</a></li>
                    <li class="dropdown">
                    </li>
                </ul>
                <ul class="nav navbar-nav navbar-right"></ul>
            </div>
        </nav>
    </div>

来源：https://stackoverflow.com/questions/47832050/my-xamarin-app-shows-my-code-in-release-mode