File Stream C#

using System;
using System.IO;
class BinReadWriteApp
{
    static void Main(string[] args)
    {
        Stream s = new FileStream("Foo.txt", FileMode.Create);
        StreamWriter w = new StreamWriter(s);
        w.Write("Hello World ");
        w.Write(123);
        w.Write(' ');
        w.Write(45.67);
        w.Close();
        s.Close();
   
        Stream t = new FileStream("Bar.dat", FileMode.Create);
        BinaryWriter b = new BinaryWriter(t);
        b.Write("Hello World ");
        b.Write(123);
        b.Write(' ');
        b.Write(45.67);
        b.Close();
        t.Close();
    }
}