public void OcenyUczniaTest()
        {
            Dictionary <int, int> test_pair = new Dictionary <int, int>();

            test_pair.Add(3, 1);

            Dictionary <int, int> actual_pair = DBhelp.OcenyUcznia(2);

            Assert.IsTrue(actual_pair.TryGetValue(3, out int val) == test_pair.TryGetValue(3, out int val1));
        }
        void wykres1()
        {
            List <KeyValuePair <int, int> > valueList = new List <KeyValuePair <int, int> >();


            Dictionary <int, int> db = DBhelp.OcenyUcznia(MainWindow.user.id);

            foreach (KeyValuePair <int, int> temp in db)
            {
                valueList.Add(temp);
            }
            //Setting data for line chart


            mcChart.Visibility    = Visibility.Hidden;
            mcCharobec.Visibility = Visibility.Hidden;
            mcChartpie.Visibility = Visibility.Visible;
            ((PieSeries)mcChartpie.Series[0]).ItemsSource = valueList;
        }