My first C# program

using System;
using System.IO;

class ReadWriteExample
{
    static void Main(string[] args)
    {
        // Use FileStream to specify the files to use for reading and writing
        FileStream readFromThisFile = new FileStream(@"C:\abc.txt", FileMode.OpenOrCreate, FileAccess.Read);
        FileStream writeToThisFile = new FileStream(@"C:\xyz.txt", FileMode.OpenOrCreate, FileAccess.Write);
           
        // Create a stream called reader to read the data
        StreamReader reader = new StreamReader(readFromThisFile);

        // Put all of the data into the variable called contentsOfTextFile
        string contentsOfTextFile = reader.ReadToEnd();

        // Create a stream called Writer to write the data
        StreamWriter writer = new StreamWriter(writeToThisFile);

        // Put all the data which is in contentsOfTextFile to that file
        writer.Write(contentsOfTextFile);

        // Close the resources
        writer.Close();
        reader.Close();
        writeToThisFile.Close();
        readFromThisFile.Close();
    }
}