c# - How to write contents of one file to another file?

Question

I need to write contents of a file to another file using File.OpenRead and File.OpenWrite methods. I am unable to figure out how to do it.

How can i modify the following code to work for me.

using (FileStream stream = File.OpenRead("C:\file1.txt"))
using (FileStream writeStream = File.OpenWrite("D:\file2.txt"))
{
       BinaryReader reader = new BinaryReader(stream);
       BinaryWriter writer = new BinaryWriter(writeStream);
       writer.Write(reader.ReadBytes(stream.Length));
}

Answer 1

    using (FileStream stream = File.OpenRead("C:\file1.txt"))
    using (FileStream writeStream = File.OpenWrite("D:\file2.txt"))
    {
        BinaryReader reader = new BinaryReader(stream);
        BinaryWriter writer = new BinaryWriter(writeStream);

        // create a buffer to hold the bytes 
        byte[] buffer = new Byte[1024];
        int bytesRead;

        // while the read method returns bytes
        // keep writing them to the output stream
        while ((bytesRead =
                stream.Read(buffer, 0, 1024)) > 0)
        {
            writeStream.Write(buffer, 0, bytesRead);
        }
    }

Just wonder why not to use this:

File.Copy("C:\file1.txt", "D:\file2.txt");