BinaryReader br = new BinaryReader(File.Open(textBox1.Text, FileMode.Open));

BinaryWriter bw = new BinaryWriter(File.Create()) // in this line i need to create a file from textBox1.Text having differentextension.

 try
            {
                StreamReader fIn = new StreamReader(path);
                string nextLine;
                Console.WriteLine("sending file");
                nextLine = fIn.ReadLine();
                while (nextLine != null)
                {

namespace client_server
{
    class Program
    {
        static void Main(string[] args)
        {
            IPAddress ip = IPAddress.Parse("127.0.0.1");
            TcpListener tcp = new TcpListener(ip, 1234);
            tcp.Start();
            Console.WriteLine("server started");