Hi Katie,

How many products are there? If it's a fairly small amount I would be tempted to get all products and then select this value, dedupe and order by name. Even if there's a few you could just use the code below in a cached partial to improve speed.

Also using umbraco.library.GetPreValues hits the database I think rather than using the cache so can cause issues on high load sites.

I'd suggest something like:

@{
    var products = Model.Content.Children();

    var dropDownValues = products.Where(x => x.HasValue("testDropDown")).Select(x => x.GetPropertyValue<string>("testDropDown")).ToList();
    dropDownValues = dropDownValues.Distinct().OrderBy(x => x).ToList();
    <select>
        @foreach (var curValue in dropDownValues)
        {
            <option value="@curValue">@curValue</option>
        }
    </select>
}

You might need to @using System.Linq at the top of your razor script.

HTH

Steve