private static void AddCourse(string courseName)
        {
            using (var context = new StudentCourse())
            {
                var course = new Course()
                {
                    CoursedName = courseName
                };

                context.Courses.Add(course);
                context.SaveChanges();
            }
        }
        private static bool Delete(int studentID)
        {
            using (var context = new StudentCourse())
            {
                var student = context.Students.FirstOrDefault(x => x.StudentID == studentID);

                if (student == null)
                {
                    return(false);
                }
                context.Students.Remove(student);
                context.SaveChanges();
                return(true);
            }
        }
        private static void Insert(string studentName, int studentAge, string studentGender, int studentCourseID)
        {
            using (var context = new StudentCourse())
            {
                var student = new Student()
                {
                    StudentName   = studentName,
                    StudentAge    = studentAge,
                    StudentGender = studentGender,
                    CourseID      = studentCourseID
                };

                context.Students.Add(student);
                context.SaveChanges();
            }
        }
        private static void Update(string studentName, int studentAge, string studentGender, int studentCourseID, int studentID)
        {
            using (var context = new StudentCourse())
            {
                var student = context.Students.FirstOrDefault(x => x.StudentID == studentID);

                if (student != null)
                {
                    student.StudentName   = studentName;
                    student.StudentAge    = studentAge;
                    student.StudentGender = studentGender;
                    student.CourseID      = studentCourseID;
                }

                context.SaveChanges();
            }
        }