/// <summary>
        /// Used to get all TestResults and all Tests from DB
        /// </summary>

        public async void GetTests()
        {
            StudentTestResults.Clear();
            AllTests.Clear();
            try
            {
                StudentTestResults = await ApiHelper.Instance.GetTestResults();

                AllTests = await ApiHelper.Instance.GetAllTests();
            }

            catch (Exception exc)
            {
                await new MessageDialog(exc.Message).ShowAsync();
            }
            DisplayAllTests();
        }