I have the following razor code on a .cshtml page in WebMatrix which works fine. How do I accomplish the same results using Umbraco?

@{
  var db = Database.Open("listings");
  var selectQueryString = "SELECT * FROM ads WHERE (Category = N'Rentals') ORDER BY PositionSort ASC";
}
    @foreach(var row in db.Query(selectQueryString)){ 
        <div itemscope itemtype="http://schema.org/LodgingBusiness" class="walk-listing">
        <div class="photo">
            <a href="@row.URL"    rel="nofollow" target="_blank"><img src="@row.Photo_1" alt="@row.title" title="@row.title" /></a>
        </div>
        <div class="summary">
            <h2><a href="@row.URL" itemprop="name" rel="nofollow" target="_blank">@row.Title</a></h2>
            <div class="walk-meta">
                <span class="location"><i class="icon-map-marker"></i> <strong>City/State - </strong>@row.City, @row.State</span><br />
                <span class="location"><i class="icon-map-marker"></i> <strong>County/Region - </strong>@row.County, @row.Region</span><br />
                <span class="priceRange"><i class="icon-map-marker"></i> <strong>Rates - </strong>@row.Rates</span><br />
                <span><i class="icon-map-marker"></i> <strong>Pet Friendly - </strong>@row.Pets</span>
            </div>
            <div itemprop="description" class="walk-summary"><strong>Description - </strong>@row.SDescription</div>
            <div itemprop="url" class="walk-meta-options"><i class="icon-heart"></i> <a href="@row.URL" rel="nofollow" target="_blank">Visit Website</a></div>
        </div>
    </div>
}