using System using System Collections Generic using System Linq using

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
var a = OnlyOne.GetInstance();
a.Value = "a";
var b = OnlyOne.GetInstance();
b.Value = "b";
Console.WriteLine(a.Value);
Console.WriteLine(b.Value);
Console.ReadLine();
}
}
class OnlyOne
{
private static OnlyOne _instance;
public string Value;
private OnlyOne() { }
public static OnlyOne GetInstance()
{
if (_instance == null)
{
_instance = new OnlyOne();
}
return _instance;
}
}
}