using EntityFrameworkCore_ConsoleApp.Models;

namespace EntityFrameworkCore_ConsoleApp
{
    public class Program
    {
        static void Main(string[] args)
        {
            using (var databaseContext = new DatabaseContext())
            {
                var categoryIds = databaseContext.Products.Select(product => product.CategoryId).Distinct().ToList();
                categoryIds.ForEach(categoryId =>
                {
                    Console.WriteLine("Category Id: " + categoryId);
                    Console.WriteLine("---------------------");
                });
            }
        }
    }
}

Output

Category Id: 1
---------------------
Category Id: 2
---------------------
Category Id: 3
---------------------

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