designPatternGuru/DesignPatternGuru/Singleton/ThreadSageSingleton/Singleton.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Singleton.ThreadSageSingleton
{
	internal class Singleton
	{
		private static Singleton _instance;

		private static readonly object _lock = new object();

		public string Value { get; set; }

		private Singleton()
		{

		}

		public static Singleton GetInstance(string value)
		{
			if (_instance == null)
			{
				lock (_lock)
				{
					if (_instance == null)
					{
						_instance = new Singleton();
						_instance.Value = value;
					}
				}
			}

			return _instance;
		}
	}
}