tipe_file_unendended

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace bat_try
{
    class Program
    {
    struct Student
    {
       const int NUM_SEMESTER = 8;
       public string fio;
       public int grade;
       public int group;
       public double[] marks;
       public DateTime birthDate;
       public Student(string info)
       {
           marks = new double[NUM_SEMESTER];

           string[] formated = info.Split(new string[] { " | " }, StringSplitOptions.RemoveEmptyEntries);
           fio = formated[0];
           // Разбор даты
           birthDate = GetDateFromString(formated[1]);
           marks = GetArrayFromString(formated[2]);
           grade = Convert.ToByte(formated[3]);
           group = Convert.ToByte(formated[4]);
       }

       private static DateTime GetDateFromString(string date)
       {
           DateTime resultingDate;
           string[] dateString = date.Split(new string[] { "." }, StringSplitOptions.RemoveEmptyEntries);
           resultingDate =
               new DateTime(Convert.ToInt16(dateString[2]), Convert.ToInt16(dateString[1]), Convert.ToInt16(dateString[0]));
           return resultingDate;
       }

       private static double[] GetArrayFromString(string marks)
       {
           double[] result = new double[NUM_SEMESTER];
           string[] arrayString = marks.Split(new String[] { " " }, StringSplitOptions.RemoveEmptyEntries);
           for (int i = 0; i < NUM_SEMESTER; ++i)
           {
               result[i] = Convert.ToDouble(arrayString[i]);

           }
           return result;
       }
        public void BinaryWrite(BinaryWriter BWriter)
        {
            BWriter.Write(this.fio);
            BWriter.Write(this.grade);
            BWriter.Write(this.group);
            for (int i = 0; i < NUM_SEMESTER; i++)
            {
            BWriter.Write(this.marks[i]);
            }
            BWriter.Write(this.birthDate.Day);
            BWriter.Write(this.birthDate.Month);
            BWriter.Write(this.birthDate.Year);

        }
        public void BinaryRead(BinaryReader BReader)
        {
            this.fio = BReader.ReadString();
            this.grade = BReader.ReadInt32();
            this.group = BReader.ReadInt32();
            this.marks = new double[NUM_SEMESTER];
            for (int i = 0; i < NUM_SEMESTER; i++)
            {
                this.marks[i] = BReader.ReadDouble();
            }
            this.birthDate = new DateTime(BReader.ReadInt32(), BReader.ReadInt32(), BReader.ReadInt32());
        }
        public void Print()
        {
            Console.Write(fio + ", {0}, ", birthDate.ToLongDateString());
            foreach (var cM in marks)
                Console.Write("{0} ", cM);
            Console.Write(", {0}, {1}\n", grade, group);

        }
    }
        public static void Main(string[] args)
        {

            string[] file = File.ReadAllLines("Students.txt");
            Student[] studs = new Student[file.Length];
            for (int i = 0; i < file.Length; ++i)
                studs[i] = new Student(file[i]);
            const string fileName = "Students.dat";
            BinaryWriter writer = new BinaryWriter(File.Open(fileName, FileMode.Append));
            foreach (var pStudent in studs)
            {
                pStudent.BinaryWrite(writer);
                pStudent.Print();
            }
            writer.Close();
            // Запись в бинарный файл окончена
            BinaryReader reader = new BinaryReader(File.Open(fileName, FileMode.Open));
            Student[] StudList = new Student[studs.Length];
            for (int i = 0; i < studs.Length; i++)
            {
                StudList[i].BinaryRead(reader);
                 StudList[i].Print();
            }

            reader.Close();
            // Чтение из файла оконченно
            string[] LastNs = new string[StudList.Count()];
            for (int i = 0; i < StudList.Count(); i++)
            {
                string[] formated = StudList[i].fio.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
                LastNs[i] = formated[0];
            }
            bool similar = false;
            for (int i = 0; i < LastNs.Count(); i++)
            {
                if (LastNs[i] == "0")
                    continue;
                for (int j = 0; j < LastNs.Count(); j++)
                {
                    if (i == j)
                        continue;
                    if (LastNs[i] == LastNs[j])
                    {
                        similar = true;
                        studs[j].Print();
                        LastNs[j] = "0";
                    }
                }
                if (similar == true)
                {
                    studs[i].Print();
                    LastNs[i] = "0";
                    similar = false;
                }
            }
                Console.ReadLine();

        }
    }
}