file read-write.cs

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Do you want to create file or open an existing one? create(c)/open(o): ");
            string d = Console.ReadLine();
            switch (d)
            {
                case "c":
                    Console.Write("Enter the name of the file you want to create: ");
                    string name = Console.ReadLine();
                    while (name.Length == 0)
                    {
                        Console.Write("File name canno't be empty, Please enter a file name: ");
                        name = Console.ReadLine();
                    }
                    FileStream F = new FileStream(name, FileMode.CreateNew, FileAccess.Write, FileShare.ReadWrite);
                    Console.Write("Do you want to write anything in the file? y/n: ");
                    string yesorno = Console.ReadLine();
                    if (yesorno == "y")
                    {
                        Console.WriteLine("Type in the text you want to write in the file");
                        string WhatToWrite = Console.ReadLine();
                        StreamWriter writer = new StreamWriter(F);
                        writer.WriteLine(WhatToWrite.ToString());
                        Console.WriteLine("Fille written successfully");
                        Console.WriteLine("Press any key to exit...");
                        writer.Close();
                    }
                    else
                    {
                        Console.WriteLine("Press any key to exit...");
                    }
                    F.Close();
                    break;

                case "o":
                    Console.Write("Enter the name of the file you want to open: ");
                    string namea = Console.ReadLine();
                    while (namea.Length == 0)
                    {
                        Console.Write("File name canno't be empty, Please enter a file name: ");
                        namea = Console.ReadLine();
                    }
                    Console.Write("Do you want to read the file or write? Read(r)/write(w)/none(n): ");
                    string yesornoexit = Console.ReadLine();
                    if (yesornoexit == "r")
                    {
                        FileStream Fr = new FileStream(namea, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                        StreamReader sr = new StreamReader(Fr);
                        Console.WriteLine("------------------");
                        Console.WriteLine(sr.ReadToEnd());
                        Console.WriteLine("------------------");
                        Console.WriteLine("File readed successfully");
                        Console.WriteLine("Press any key to exit...");
                        sr.Close();
                        Fr.Close();
                    }
                    else if (yesornoexit == "w")
                    {
                        FileStream Fw = new FileStream(namea, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
                        StreamWriter sw = new StreamWriter(Fw);
                        Console.WriteLine("Type in the text you want to write in the file");
                        string WhatToWritew = Console.ReadLine();
                        sw.WriteLine(WhatToWritew.ToString());
                        Console.WriteLine("File written successfully");
                        Console.WriteLine("Press any key to exit...");
                        sw.Close();
                        Fw.Close();
                    }
                    else
                    {
                        Console.WriteLine("Press any key to exit...");
                    }
                    break;

                default:
                    Console.WriteLine("Sorry that option does not exist");
                    Console.WriteLine("Press any key to exit...");
                    break;
            }
            Console.ReadKey();
        }
    }
}