generic hierarchy1, C#

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//Title of this code
//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 Rextester
{
    public class Gen<T>
    {
       T ob;
        public Gen(T t)
        {
            ob=t;
        }
        
        public T GetOb()
        {
         return ob;   
        }
    }
    public class Gen2<T,V>:Gen<T>
    {
        V ob2;
        T ob3;
        public Gen2(T t,V v):base(t)
        {
            ob2=v;
            ob3=t;
        }
        
        public V GetOb2()
        {
         return ob2;   
        }
         public T GetOb3()
        {
         return ob3;   
        }
    }     
    public class Program
    {
        public static void Main(string[] args)
        {
         Gen2<int,double> g1=new Gen2<int,double>(10,15.2);
            Console.WriteLine(g1.GetOb());
            Console.WriteLine(g1.GetOb2());
            Console.WriteLine(g1.GetOb3());
            Gen<Gen2<int,double>>g2=new Gen<Gen2<int,double>>(g1);
             Console.WriteLine(g2.GetOb().GetOb2()+" "+g2.GetOb().GetOb3());
            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0.11 sec, absolute running time: 0.09 sec, cpu time: 0.08 sec, average memory usage: 16 Mb, average nr of threads: 4