Friends database, using files - Practice Exercises C# Sharp

using System;
using System.IO;
public class FriendsDatabase
{
    struct people
    {
        public string name;
        public string email;
        public string address;
        public ushort year;
    }

    public static void Main()
    {
        int total = 275;
        people[] p = new people[total];
        int amount = 0;

        char option;
        bool found;
        string textSearch;
        string name = "friends.dat";

        if (File.Exists(name))
        {
            StreamReader file = File.OpenText(name);
            amount = Convert.ToInt32(file.ReadLine());

            file.ReadLine();

            for (int i = 0; i < amount; i++)
            {
                if (i < total)
                {
                    p[i].name = file.ReadLine();
                    p[i].email = file.ReadLine();
                    p[i].address = file.ReadLine();
                    p[i].year = Convert.ToUInt16(file.ReadLine());
                    file.ReadLine();
                }
            }
            file.Close();
        }

        do
        {
            Console.WriteLine("1- Add data");
            Console.WriteLine("2- Show");
            Console.WriteLine("3- View all data");
            Console.WriteLine("4- Show between dates");
            Console.WriteLine("5- Show oldest");
            Console.WriteLine("6- Show fields match");
            Console.WriteLine("0- Exit");

            Console.Write("Enter a option: ");
            option = Convert.ToChar(Console.ReadLine());

            switch (option)
            {

                case '1':
                    if (amount < total - 1)
                    {
                        do
                        {
                            Console.Write("Name: ");
                            p[amount].name = Console.ReadLine();

                            if (p[amount].name.Length > 40)
                                Console.WriteLine("Max 40 letters");
                        }
                        while (p[amount].name.Length > 40);

                        do
                        {
                            Console.Write("Email: ");
                            p[amount].email = Console.ReadLine();

                            if (p[amount].email.Length > 30)
                                Console.WriteLine("Max 30 letters");
                        }
                        while (p[amount].email.Length > 30);

                        do
                        {
                            Console.Write("Address: ");
                            p[amount].address = Console.ReadLine();

                            if (p[amount].address.Length > 150)
                                Console.WriteLine("Max 150 letters");
                        }
                        while (p[amount].address.Length > 150);

                        do
                        {
                            Console.Write("Year: ");
                            p[amount].year = Convert.ToUInt16(Console.ReadLine());

                            if (p[amount].year < 1850 || p[amount].year > 2100)
                                Console.WriteLine("1850-2100");
                        }
                        while (p[amount].year < 1850 || p[amount].year > 2100);

                        amount++;
                        Console.WriteLine();
                    }
                    else
                        Console.WriteLine("Full");

                    break;

                case '2':
                    if (amount == 0)
                        Console.WriteLine("No data");
                    else
                    {
                        for (int i = 0; i < amount; i++)
                        {
                            if (p[i].name.Length <= 30)
                                Console.WriteLine("{0}: Name = {1}", i + 1, p[i].name);
                            else
                                Console.WriteLine("{0}: Name = {1}", i + 1,
                                p[i].name.Substring(0, 30) + "...");

                            if (i % 20 == 19)
                                Console.ReadLine();
                        }
                    }

                    break;
                case '3':
                    Console.Write("Enter the person: ");
                    textSearch = Console.ReadLine();

                    found = false;
                    for (int i = 0; i < amount; i++)
                    {
                        if (textSearch.ToLower() == p[i].name.ToLower())
                        {
                            found = true;
                            Console.WriteLine("{0}: Year = {1}, Email = {2}, Address = {3}",
                            i + 1, p[i].year, p[i].email, p[i].address);
                        }
                    }

                    if (!found)
                        Console.WriteLine("Not exists");

                    break;

                case '4':
                    Console.Write("Enter the first year: ");
                    int year1 = Convert.ToUInt16(Console.ReadLine());

                    Console.Write("Enter the second year: ");
                    int year2 = Convert.ToUInt16(Console.ReadLine());


                    if (year1 > year2)
                    {
                        int aux = year2;
                        year2 = year1;
                        year1 = aux;
                    }

                    found = false;
                    for (int i = 0; i < amount; i++)
                    {
                        if (p[i].year >= year1 && p[i].year <= year2)
                        {
                            Console.Write(p[i].name + " - ");
                            found = true;
                        }
                    }

                    if (!found)
                        Console.WriteLine("Not found");
                    break;


                case '5':
                    if (amount == 0)
                        Console.WriteLine("No data");
                    else
                    {
                        int firstYear = p[0].year;
                        found = false;

                        for (int i = 1; i < amount; i++)
                            if (p[i].year < firstYear)
                                firstYear = p[i].year;

                        for (int i = 0; i < amount; i++)
                        {
                            Console.WriteLine("{0}: Address = {2}, Year = {3}",
                            i + 1, p[i].name, p[i].address, p[i].year);

                            if (Console.ReadLine().ToLower() == "end")
                                break;
                        }
                    }
                    break;

                case '0':
                    break;

                default:
                    Console.WriteLine("Wrong option");
                    break;
            }

        }
        while (option != '0');

        StreamWriter dataFile = File.CreateText(name);
        dataFile.WriteLine(amount);
        dataFile.WriteLine();

        for (int i = 0; i < amount; i++)
        {
            dataFile.WriteLine(p[i].name);
            dataFile.WriteLine(p[i].email);
            dataFile.WriteLine(p[i].address);
            dataFile.WriteLine(p[i].year);
            dataFile.WriteLine();
        }

        dataFile.Close();
    }
}