using System;

using System.Collections.Generic;

​

public class T

{

}

public class Program

{   

    public static void Main()

    {

        var dict = new Dictionary<int, T>();

        var t = new T();

        dict.Add(1, t);

        if(dict.TryGetValue(1, out t))

        { 

            Console.WriteLine("Hello World"); 

        }

        T t1;

        if(dict.TryGetValue(1, out t1))

        {

            Console.WriteLine("Hello World"); 

        }

    }

}