public void AddCategory(TestCategoryW cat)
        {
            var category = cat.ToBase();
            category.Id = Guid.NewGuid();
            db.TestCategories.Add(category);

            db.SaveChanges();
        }
        public bool IsExisting(TestCategoryW cat)
        {
            var founded = db.TestCategories.FirstOrDefault(x => x.Name.ToLower() == cat.Name.ToLower());
            if (founded != null)
                return true;

            return false;
        }
        public void EditCategory(TestCategoryW cat)
        {
            var category = db.TestCategories.Single(c => c.Id == cat.Id);
            category.Name = cat.Name;

            db.SaveChanges();
        }