Studentcs

    public class Student
    {
        public Guid Id { get; set; }
        public string Name { get; set; }
        public int Marks { get; set; }
    }
///////

public class StudentCrud
    {
        public static List<Student> GetStudents()
        {
            List<Student> test = new List<Student>();

            var student = new Student
            {
                Id = Guid.NewGuid(),
                Name = "Cyril",
                Marks = 100
            };
            test.Add(student);

            return test;


        }
        public static void AddTolist(string name,int marks)
        {
            var student = new Student
            {
                Id=Guid.NewGuid(),
                Name=name,
                Marks=marks,
            };
            GetStudents().Add(student);

        }
    }