Stuff

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace PhoneBook
{
    class FileIO
    {
        public string name;
        public string lastname;
        public string phone;
        //public FileIO(string _name, string _phone)
        //{
        //    name = _name;
        //    phone = _phone;
        //}
        public void add()
        {
            StreamWriter fw = File.AppendText("phones.txt");
            fw.WriteLine("Lastname: " + lastname + "  " + "Name: " + name + "  " + "Phone: " + phone);
            fw.Close();
        }

        public string searchbyName()
        {
            string buffer = null;
            string RecordSearched = "";
            int compareResult = 0;
            int counter = 0;
            if (!(File.Exists("phones.txt")))
            {
                RecordSearched = "Error, no phone index";
            }
            else
            {
                StreamReader fr = File.OpenText("phones.txt");
                while ((buffer = fr.ReadLine()) != null)
                {
                    string bufferNonspaced = buffer.Replace(" ", "");
                    if ((compareResult = (bufferNonspaced.IndexOf("Name:" + name))) != -1)
                    {
                        counter++;
                        RecordSearched += counter + "#   " + buffer + Environment.NewLine;
                    }
                }
                fr.Close();
                if (counter == 0)
                    RecordSearched = "Not Found";
            }
            return RecordSearched;
        }

        public string searchbyLastName()
        {
            string buffer = null;
            string RecordSearched = "";
            int compareResult = 0;
            int counter = 0;
            if (!(File.Exists("phones.txt")))
            {
                RecordSearched = "Error, no phone index";
            }
            else
            {
                StreamReader fr = File.OpenText("phones.txt");
                while ((buffer = fr.ReadLine()) != null)
                {
                    string bufferNonspaced = buffer.Replace(" ", "");
                    if ((compareResult = (bufferNonspaced.IndexOf("Lastname:" + lastname))) != -1)
                    {
                        counter++;
                        RecordSearched += counter + "#   " + buffer + Environment.NewLine;
                    }
                }
                fr.Close();
                if (counter == 0)
                    RecordSearched = "Not Found";
            }
            return RecordSearched;
        }

        public string deletebyName()
        {
            string buffer = null;
            bool error = false;
            string RecordDeleted = null;
            int compareResult = 0;
            int counter = 0;
            if (!(File.Exists("phones.txt")))
            {
                RecordDeleted = "No phone index";
                error = true;
            }
            else
            {
                StreamWriter fw = new StreamWriter("temp.txt");
                StreamReader fr = File.OpenText("phones.txt");
                while ((buffer = fr.ReadLine()) != null)
                {
                    string bufferNonspaced = buffer.Replace(" ", "");
                    if ((compareResult = (bufferNonspaced.IndexOf("Name:" + name))) != -1)
                    {
                        counter++;
                        RecordDeleted +=counter + "#   " +  buffer + "  Deleted" + Environment.NewLine;
                    }
                    else
                    {
                        fw.WriteLine(buffer);
                    }
                }
                fr.Close();
                fw.Close();
                if (counter == 0)
                    RecordDeleted = "Not Found";
            }
            File.Delete("phones.txt");
            if (!error)
            {
                File.Move("temp.txt", "phones.txt");
            }
            return RecordDeleted;
        }

        public string deletebyLastName()
        {
            string buffer = null;
            bool error = false;
            string RecordDeleted = null;
            int compareResult = 0;
            int counter = 0;
            if (!(File.Exists("phones.txt")))
            {
                RecordDeleted = "No phone index";
                error = true;
            }
            else
            {
                StreamWriter fw = new StreamWriter("temp.txt");
                StreamReader fr = File.OpenText("phones.txt");
                while ((buffer = fr.ReadLine()) != null)
                {
                    string bufferNonspaced = buffer.Replace(" ", "");
                    if ((compareResult = (bufferNonspaced.IndexOf("Lastname:" + lastname))) != -1)
                    {
                        counter++;
                        RecordDeleted += counter + "#   " + buffer + "  Deleted" + Environment.NewLine;
                    }
                    else
                    {
                        fw.WriteLine(buffer);
                    }
                }
                fr.Close();
                fw.Close();
                if (counter == 0)
                    RecordDeleted = "Not Found";
            }
            File.Delete("phones.txt");
            if (!error)
            {
                File.Move("temp.txt", "phones.txt");
            }
            return RecordDeleted;
        }
    }
}