static void Main(string[] args) { IGradeTracker book = CreateGradeBook(); //book.Add(78.1f); //book.Add(94.6f); //book.Add(82.3f); try { using (FileStream stream = File.Open("Grades.txt", FileMode.Open)) using (StreamReader reader = new StreamReader(stream)) { string line = reader.ReadLine(); while (line != null) { float grade = float.Parse(line); book.Add(grade); line = reader.ReadLine(); } } } catch (FileNotFoundException) { Console.WriteLine("Could Not Locate Grades.txt File"); return; } catch (UnauthorizedAccessException) { Console.WriteLine("No Access"); return; } finally { } //string[] lines = File.ReadAllLines("Grades.txt"); //foreach (string line in lines) //{ // float grade = float.Parse(line); // book.Add(grade); //} //foreach (var grade in book) //{ // Console.Write(grade + " "); //} book.NameChanged += book.OnNameChanged; book.Name = "KishorKira Book"; //book.Name = "KishorKira Book"; book.Name = "Ks Book"; WriteName(book.Name); book.WriteGrades(Console.Out); GradeStatistics statistics = book.ComputeStatistics(); Console.WriteLine($"Avarage Grade : {statistics.AvarageGrade}"); Console.WriteLine($"Lowest Grade : {statistics.LowestGrade}"); Console.WriteLine($"Highest Grade : {statistics.HighestGrade}"); Console.WriteLine($"Letter Grade : {statistics.LetterGrade}"); Console.WriteLine($"Description : {statistics.Description}"); }