Product.cs

// Pretend this is a LINQ to SQL entity
public class Product
{
    public string Name { get; private set; }
    public IEnumerable<ProductTranslation> Translations { get; private set; }


    public Product(string name, IEnumerable<ProductTranslation> translations)
    {
        Name = name;
        Translations = translations;
    }
}

ProductTranslation.cs

// Pretend this is a LINQ to SQL entity
public class ProductTranslation
{
    public string Name { get; set; }


    public ProductTranslation(string name)
    {
        Name = name;
    }
}

Translator.cs

public static class Translator
{
    public static dynamic Translate(dynamic original, Func<dynamic, dynamic> expression)
    {
        var translation = Enumerable.FirstOrDefault(original.Translations);
        if (translation == null) {
            return expression.Invoke(original);
        }

        return expression.Invoke(translation);
    }
}