MentorGroup

using System;
using System.Collections.Generic;
using System.Linq;
using System.Globalization;

namespace MentorGroup
{
    public class StartUp
    {
        public static void Main()
        {
            List<Student> students = new List<Student>();
            string studentName = string.Empty;
            while (true)
            {
                string inputStudentAndDate = Console.ReadLine();

                if (inputStudentAndDate == "end of dates")
                {
                    break;
                }

                var studentInfo = inputStudentAndDate
                    .Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                    .ToArray();
                studentName = studentInfo[0];
                if (studentInfo.Length == 1)
                {
                    if (students.Any(x => x.Name == studentName))
                    {
                        continue;
                    }
                    Student student = new Student();
                    student.Name = studentName;
                    students.Add(student);
                    continue;
                }
                else
                {
                    var dates = studentInfo[1]
                        .Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries)
                        .ToArray();
                    if (students.Any(x => x.Name == studentName))
                    {
                        var currentStudent = students.First(x => x.Name == studentName);
                        foreach (var date in dates)
                        {
                            currentStudent.DatesAttended.Add(DateTime.ParseExact(date, "dd/MM/yyyy", CultureInfo.InvariantCulture));
                        }
                    }
                    else
                    {
                        Student student = new Student();
                        studentName = studentInfo[0];
                        student.Name = studentName;
                        foreach (var date in dates)
                        {
                            student.DatesAttended.Add(DateTime.ParseExact(date, "dd/MM/yyyy", CultureInfo.InvariantCulture));
                        }
                        students.Add(student);
                    }
                }

            }
            while (true)
            {
                string inputComments = Console.ReadLine();

                if (inputComments == "end of comments")
                {
                    break;
                }
                var inputCommentArgs = inputComments
                    .Split(new char[] { '-' })
                    .ToArray();
                studentName = inputCommentArgs[0];
                if (inputCommentArgs.Length == 1)
                {
                    if (students.Any(x => x.Name == studentName))
                    {
                        continue;
                    }
                }
                else
                {
                    var comment = inputCommentArgs[1];
                    if (students.Any(x => x.Name == studentName))
                    {
                        var currentStudent = students.First(x => x.Name == studentName);
                        currentStudent.Comments.Add(comment);
                    }
                }
            }
            foreach (Student student in students.OrderBy(x => x.Name))
            {

                Console.WriteLine(student.Name);
                Console.WriteLine("Comments:");
                foreach (var item in student.Comments)
                {
                    Console.WriteLine($"- {string.Join("/r/n", item)}");
                }
                Console.WriteLine("Dates attended:");
                foreach (var item in student.DatesAttended.OrderBy(x => x.Date))
                {
                    Console.WriteLine($"-- {item.ToString("dd/MM/yyyy")}");
                }
            }
        }
    }
    class Student
    {
        public string Name { get; set; }
        public List<DateTime> DatesAttended { get; set; }
        public List<string> Comments { get; set; }
        public Student()
        {
            DatesAttended = new List<DateTime>();
            Comments = new List<string>();
        }
    }
}