public class OnlineUserMiddleWare
    {
        private readonly RequestDelegate _next;
        private readonly IMemoryCache _memoryCache;

        public OnlineUserMiddleWare(RequestDelegate next, IMemoryCache memoryCache)
        {
            _next = next;
            _memoryCache = memoryCache;
        }

        public async Task Invoke(HttpContext context)
        {
            if (!_memoryCache.TryGetValue("OnlineUsers", out Dictionary<string,DateTime> onlineUsers))
            {
                onlineUsers = new Dictionary<string, DateTime>();
                _memoryCache.Set("OnlineUsers", onlineUsers);
            }
            if (context.User.Identity.IsAuthenticated)
            {
                var name = context.User.Identity.Name;
                if (name != null)
                {
                    if (onlineUsers.ContainsKey(name))
                        onlineUsers[name] = DateTime.Now;
                    else
                        onlineUsers.Add(name, DateTime.Now);
                }

            }

           
                foreach (var online in onlineUsers)
                {
                    if (online.Value < DateTime.Now.AddMinutes(-10))
                        onlineUsers.Remove(online.Key);
                }
           
            await _next(context);
        }

        
    }

 public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IServiceProvider serviceProvider)
        {
         ...
            app.UseMiddleware<OnlineUserMiddleWare>();
         ...
        }

public class DashboardController 
    {
        private readonly IMemoryCache _memoryCache;
        public DashboardController(memoryCache)
        {
            _memoryCache = memoryCache;
        }
        public IActionResult Index()
        {
         
            _memoryCache.TryGetValue("OnlineUsers", out Dictionary<string, DateTime> onlineUsers);
            ViewBag.OnlineUsers = onlineUsers.Count;
            return View();
        }       
    }

           if(context.Request.Path.StartsWithSegments("/Identity/Account/Login"))
            {
                foreach (var online in onlineUsers)
                {
                    if (online.Value < DateTime.Now.AddMinutes(-10))
                        onlineUsers.Remove(online.Key);
                }
            }

Int temp;
Int a=1;
temp=a;
a=2;
.
.
a=temp;

int main()
{
  MyClass One = new MyClass();
  MyClass Temp = new MyClass();
  // Set an initial value.
  One.Value = 10;
  One.Name = "Ten";
  // Save the state of the value.
  Temp.Value = One.Value;
  Temp.Name = One.Name;
  // Change the value.
  One.Value = 99;
  One.Name = "Ninety Nine";
  // Undo and restore the state.
  One.Value = Temp.Value;
  One.Name = Temp.Name;
}

dotnet new console

abstract class MementoBase
{
  protected Guid mementoKey = Guid.NewGuid();
  abstract public void SaveMemento(Memento memento);
  abstract public void RestoreMemento(Memento memento);
}

class Memento
{
    private Dictionary<Guid, object> stateList = new Dictionary<Guid, object>();
    public object GetState(Guid key)
    {
        return stateList[key];
    }
    public void SetState(Guid key, object newState)
    {
        stateList[key] = newState;
    }
    public Memento()
    {
    }
}

class ConcreteOriginator : MementoBase
{
  private int value = 0;
  public ConcreteOriginator(int newValue)
  {
    SetData(newValue);
  }
  public void SetData(int newValue)
  {
    value = newValue;
  }
  public void Speak()
  {
    Console.WriteLine("My value is " + value.ToString());
  }
  public override void SaveMemento(Memento memento)
  {
    memento.SetState(mementoKey, value);
  }
  public override void RestoreMemento(Memento memento)
  {
    int restoredValue = (int)memento.GetState(mementoKey);
    SetData(restoredValue);
  }
}

static void Main(string[] args)
{
  Memento memento = new Memento();
  // Create an originator, which will hold our state data.
  ConcreteOriginator myOriginator = new ConcreteOriginator("Hello World!", StateType.ONE);
  ConcreteOriginator anotherOriginator = new ConcreteOriginator("Hola!", StateType.ONE);
  ConcreteOriginator2 thirdOriginator = new ConcreteOriginator2(7);
  // Set some state data.
  myOriginator.Speak();
  anotherOriginator.Speak();
  thirdOriginator.Speak();
  // Save the states into our memento.
  myOriginator.SaveMemento(memento);
  anotherOriginator.SaveMemento(memento);
  thirdOriginator.SaveMemento(memento);
  // Now change our originators' states.
  myOriginator.SetData("Goodbye!", StateType.TWO);
  anotherOriginator.SetData("Adios!", StateType.TWO);
  thirdOriginator.SetData(99);
  myOriginator.Speak();
  anotherOriginator.Speak();
  thirdOriginator.Speak();
  // Restore our originator's state.
  myOriginator.RestoreMemento(memento);
  anotherOriginator.RestoreMemento(memento);
  thirdOriginator.RestoreMemento(memento);
  myOriginator.Speak();
  anotherOriginator.Speak();
  thirdOriginator.Speak();
  Console.ReadKey();
}

Hello World! I'm in state ONE
Hola! I'm in state ONE
My value is 7
Goodbye! I'm in state TWO
Adios! I'm in state TWO
My value is 99
Hello World! I'm in state ONE
Hola! I'm in state ONE
My value is 7