public void TestMean()
        {
            StudentGrades grades = new StudentGrades();

            grades.MakeStudentTable();

            DataRow row = grades.students.NewRow();

            row["id"]             = 1;
            row["Name"]           = "Mohammed";
            row["Biology Mark"]   = 67;
            row["Physics Mark"]   = 78;
            row["Chemistry Mark"] = 70;
            row["Grade"]          = "First Class";
            grades.students.Rows.Add(row);
        }
        public static void App03Main(string[] args)
        {
            Console.WriteLine("BNU CO453 Applications Programming 2020-2021!");
            Console.WriteLine();
            Console.Beep();

            StudentGrades game = new StudentGrades();

            game.MakeStudentTable();
            for (int i = 0; i < 10; i++)
            {
                game.Grades();
            }

            game.PrintStudents();
            int[] stats = game.CalculateStats("Biology Mark");
            Console.WriteLine("Minimum Biology Mark: " + stats[0]);
            Console.WriteLine("Maximum Biology Mark: " + stats[1]);
            Console.WriteLine("Mean Biology Mark: " + stats[2]);

            stats = game.CalculateStats("Chemistry Mark");
            Console.WriteLine("Minimum Chemistry Mark: " + stats[0]);
            Console.WriteLine("Maximum Chemistry Mark: " + stats[1]);
            Console.WriteLine("Mean Chemistry Mark: " + stats[2]);

            stats = game.CalculateStats("Physics Mark");
            Console.WriteLine("Minimum Physics Mark: " + stats[0]);
            Console.WriteLine("Maximum Physics Mark: " + stats[1]);
            Console.WriteLine("Mean Physics Mark: " + stats[2]);

            double[] GradePercentages = game.CalculateGradePercentage();
            Console.WriteLine("Percentage for First Class: " + GradePercentages[0]);
            Console.WriteLine("Percentage for Upper Second Class: " + GradePercentages[1]);
            Console.WriteLine("Percentage for Lower Second Class: " + GradePercentages[2]);
            Console.WriteLine("Percentage for Third Class: " + GradePercentages[3]);
            Console.WriteLine("Percentage for Fail: " + GradePercentages[4]);
        }