This is my diagram:

And this is my method to add food and its category. Food is added to the database correctly, but it does not add to foodcategorySelected table

public async Task AddFoodCategoryToFoodList(int foodId, List<int> foodCategoryId)
{
    if (!foodCategoryId.Any()) 
         return;

    foreach (var foodCat in foodCategoryId)
    {
        FoodSelectedCategory foodSelectedCategory = new FoodSelectedCategory()
                             {
                                 FoodId = foodId,
                                 FoodCategoryId = foodCat,
                                 RegisterDate = DateTime.Now,
                             };
        await _foodRepository.AddFoodCategoryToFood(foodSelectedCategory);
        await _foodRepository.SaveChanges();
    }
}

Before that I have a method to get information with food and selected category.

Food is added to the database and when goes to this method, however it takes all Ids (food and food categories) but can not add and have this error:

My main method:

public async Task<CreateFoodResult> CreateFoodByAdmin(CreateFoodViewModel createFoodViewModel) { Food food = new Food()
{
     FoodTitle = createFoodViewModel.FoodTitle.SanitizeText(),
     IsActive = createFoodViewModel.IsActive,
     RegisterDate = DateTime.Now,
     FoodDescription = createFoodViewModel.FoodDescription.SanitizeText(),
     IsDelete = true,
     CreatedUser = createFoodViewModel.CreatedUser,
};

if (createFoodViewModel.FoodAvatar != null)
{
     string imageName = NameGenerator.GenerateUniqCode() +
                        Path.GetExtension(createFoodViewModel.FoodAvatar.FileName);
     createFoodViewModel.FoodAvatar.AddImageToServer(imageName, FilePath.FilePath.FoodAvatarServer, 100,
         100, FilePath.FilePath.FoodAvatarThumbServer);
     food.ImageFood = imageName;
}

await _foodRepository.CreateFoodByAdmin(food);
await _foodRepository.SaveChanges();

if (createFoodViewModel.SelectedFoodCategory != null)
{
     await AddFoodCategoryToFoodList(food.FoodId, createFoodViewModel.SelectedFoodCategory);
     await _foodRepository.SaveChanges();
}

return CreateFoodResult.Success;

I get this error:

SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint “FK_FoodSelectedCategories_FoodCategories_FoodCategoryId”. The conflict occurred in database “EvSef_db”, table “dbo.FoodCategories”, column ‘FoodCategoryId’.