public void Test0060()
        {
            #region テストデータ準備

            var testEntityExist    = TestUtilLib.GenarateRandomTodoTask();
            var testEntityNotExist = TestUtilLib.GenarateRandomTodoTask();

            using (var context = new EfDbContext())
            {
                context.Add(testEntityExist);
                context.SaveChanges();
            }
            using (var context = new EfDbContext()) Assert.AreEqual(1, context.TodoTasks.Count());

            #endregion

            Assert.AreEqual(1, DalTodoTask.Delete(testEntityExist.TodoTaskId));
            Assert.AreEqual(0, DalTodoTask.Delete(testEntityNotExist.TodoTaskId));
            using (var context = new EfDbContext()) Assert.AreEqual(0, context.TodoTasks.Count());
        }
 /// <summary>
 /// ボタン〔削除〕押下処理
 /// </summary>
 private void Delete_Click()
 {
     DalTodoTask.Delete(this.TodoTaskId.Value);
     this.RequestClose?.Invoke(new DialogResult(ButtonResult.Cancel));
 }