BlogPost1_ManualSortingMethod.cs

public IQueryable<Product> ApplyOrderBy(IQueryable<Product> query, string property)
{
    switch (property)
    {
        case "Name":
            return query.OrderBy(p => p.Name);
        case "Quantity":
            return query.OrderBy(p => p.Quantity);
        case "Price":
            return query.OrderBy(p => p.Price);
        default:
            return query;
    }
}