How to add/remove components dynamically to MVC layout page

How you can achieve it, You can add condition before render that tag. For example

@{
    if(ViewBag.ViewName == "test")
    {
        <div class="testcss">Good Morning!!!!!!!!!!!!!!!1</div>
    }
}

If ViewName property of ViewBag object set to "test" from controller then you just render that div block otherwise it will not render.