public static void UpdateRegister(Registeration UpdateRegisteration)
        {
            var oldRegister = GetRegisterations(UpdateRegisteration.RegID);

            oldRegister.StudentId  = UpdateRegisteration.StudentId;
            oldRegister.CourseCode = UpdateRegisteration.CourseCode;
            db.SaveChanges();
        }
        public static void studentUnRegisterCourse(int regid, int coursecode)
        {
            Registeration reg = db.Registeration.Where(reg => reg.CourseCode == coursecode &&
                                                       reg.RegID == regid).Single();

            db.Registeration.Remove(reg);
            db.SaveChanges();
        }
        public static Registeration studentRegister(int studentid, int coursecode)
        {
            var reg = new Registeration
            {
                StartDate  = DateTime.UtcNow,
                StudentId  = studentid,
                CourseCode = coursecode
            };

            db.Registeration.Add(reg);
            db.SaveChanges();
            return(reg);
        }
        static void Main(string[] args)
        {
            // var studentCurInfo = new studInfo();

            //private static List<CourseDetails> courses = new List<CourseDetails>();
            var courses  = new CourseDetails();
            var students = new Studentdetails();
            var register = new Registeration();

            Console.WriteLine("*********************");
            Console.WriteLine("Welcome to School!");
            while (true)
            {
                Console.WriteLine("*********************");
                Console.WriteLine("0. Exit");
                Console.WriteLine("1. Add New Student");
                Console.WriteLine("2. Add Courses");
                Console.WriteLine("3. New Registeration");
                Console.WriteLine("4. Unregister");
                Console.WriteLine("5. Remove Student");
                Console.WriteLine("6. View all Students");
                // Console.WriteLine("4. Get all Students by email");

                Console.WriteLine("Select an option: ");
                var option = Console.ReadLine();
                switch (option)
                {
                case "0":
                    Console.WriteLine("Thank You!!!");
                    return;


                case "1":
                    Console.WriteLine("Student Name:");
                    var studName = Console.ReadLine();

                    Console.WriteLine("Student Email Address:");
                    var studEmail = Console.ReadLine();

                    Console.WriteLine("Student Gender:");
                    //Array of string assign to variable
                    var studGen = Enum.GetNames(typeof(TypeofGender));
                    for (var i = 0; i < studGen.Length; i++)
                    {
                        Console.WriteLine($"{i}. {studGen[i]}");
                    }

                    //Type casting
                    //Generic methods "<>"
                    //Read the value asking the enum to parse the string into and then give you the type.
                    var studGender = Enum.Parse <TypeofGender>(Console.ReadLine());

                    var studentInfo = School.AddStudent(studName, studEmail, studGender);

                    Console.WriteLine($"StudID: {studentInfo.StudentId} " +
                                      $" StudName: {studentInfo.StudName} " +
                                      $" Email: {studentInfo.StudEmailAdd} " +
                                      $" StudentGender: {studentInfo.StudGender} ");

                    break;

                case "2":

                    Console.WriteLine("Description:");
                    var desc = Console.ReadLine();

                    Console.WriteLine("courseFee:");
                    var coursefee = Convert.ToDecimal(Console.ReadLine());

                    var courseInfo = School.Addcourse(desc, coursefee);
                    Console.WriteLine($"CourseCode: {courseInfo.CourseCode} " +
                                      $" Description: {courseInfo.Description} " +
                                      $" Fee: {courseInfo.CourseFee:C}");

                    Console.WriteLine("new course created!");

                    School.PrintAllcoursedetails();
                    break;

                case "3":

                    Console.WriteLine("StudentId:");
                    var studentId = Convert.ToInt32(Console.ReadLine());

                    Console.WriteLine("CourseCode:");
                    var coursecode = Convert.ToInt32(Console.ReadLine());

                    var registerInfo = School.studentRegister(studentId, coursecode);

                    Console.WriteLine($"StudID: {registerInfo.StudentId} " +
                                      $" CourseCode: {registerInfo.CourseCode} ");

                    break;

                case "4":

                    Console.WriteLine("Studet Id:");
                    var studentid = Convert.ToInt32(Console.ReadLine());

                    Console.WriteLine("CourseCode:");
                    var courcode = Convert.ToInt32(Console.ReadLine());

                    School.studentUnRegisterCourse(studentid, courcode);

                    Console.WriteLine("unregistered student from course.");
                    break;

                case "5":
                    Console.WriteLine("student ID:");
                    var studId = Convert.ToInt32(Console.ReadLine());

                    School.RemoveStudent(studId);

                    Console.WriteLine("Student Record Deleted!");
                    break;

                case "6":
                    // School.PrintAllStudentswithcourses();
                    //  School.PrintAllRegisterations();
                    Console.WriteLine("student ID:");
                    //var studId1 = Convert.ToInt32(Console.ReadLine());
                    //School.GetAllCoursesByStudent(studId1);
                    //
                    // foreach (var stud in student)
                    // {
                    //   Console.WriteLine($"SID: {stud.StudentId}, " +
                    //     $"SN: {stud.CourseCode}");
                    //}
                    School.GetAllRegisterationforCourses();
                    break;

                case "7":

                default:
                    Console.WriteLine("Invalid option! Try again!");
                    break;
                }
            }
        }