I need to make a class using only C#

Im asking how to create them

'Create' as in instantiate the Entry class and call the methods??? Like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
Entry entry = new Entry();
entry.Load();
entry.Save();
}
}

class Entry
{

public string Name { get; set; }
public IEnumerable<string> Emails { get; set; }

public void Save()
{
TextWriter tsw = new StreamWriter(@"C:\Emails.txt");
tsw.WriteLine(Name);
tsw.WriteLine();
foreach (string email in Emails)
{
tsw.WriteLine(email);
}
tsw.Close();
Process.Start(@"C:\Emails.txt");


}

public void Load()
{
TextReader trs = new StreamReader(@"C:\Emails.txt");
Console.WriteLine(trs.ReadToEnd());
trs.Close();
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
}

}

static class Process
{
public static void Start(string path)
{
// Your Process.Start code here
}
}
}