Saving data

// Saving data program

using System;
using System.IO;

class Submission
{
    // -------------------------
    // Subprograms
    // -------------------------
    static string load(string filename)
    {
        StreamReader file = new StreamReader(filename);
        string user = file.ReadLine();
        user = user.Trim();
        file.Close();
        return user;
    }

    static void save(string user, string filename)
    {
        StreamWriter file = new StreamWriter(filename);
        file.WriteLine(user);
        file.Close();
    }

    // -------------------------
    // Main program
    // -------------------------
    public static void Main(string[] args)
    {
        string user = load("datafile.txt");
        Console.WriteLine($"This program was written by {user}.");
    }

}

You can submit as many times as you like. Only your latest submission will be taken into account.