property_comparison3, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Base
{
    public class Test1
    {
        public Test1() { num = 100; }
        public int num;
    }
    
    public class Test2
    {
        public Test2() { num = 100; }
        public int num { get; set; }
    }
    
    public class Test3
    {
        public Test3() { num_ = 100; }
        private int num_; 
        public int num { get {return num_;} }
    }

public class Test4
    {
        public Test4() { num = 100; }
        public int num 
        { 
            get;
            private set;
        }
    }
    
}

namespace Rextester
{
    using Test = Base.Test3;
    
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            Test t = new Test();
            Console.WriteLine("Init test with value: {0}", t.num);
          t.num = 500;
            Console.WriteLine("New test value: {0}", t.num);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 12 Mb, average nr of threads: 2, absolute service time: 0,27 sec