StackOverflow Generic , 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 abstract class FooBase 
   {
    public abstract void FooMethod(FooBase obj);
   }
    public class FooB
    {
        public void FooMethod(FooB ob)
        {
        }
    }

//Implement FooBase so that Foo is guaranteed to have a FooMethod implementation
public class Foo : FooB
{

public Foo()
    {
    }
    public Foo(Foo x, Foo y)
    {
        ThisX = x;
        ThisY = y;
    }

public Foo ThisX { get; set; }
    public Foo ThisY { get; set; }

//Override FooMethod so that it can do whatever Foo needs it to do
    /*public override void FooMethod(FooBase ob)
    {
        Console.WriteLine("Hiiiii\t" + ob);

}*/

}

public class Gen<T> where T : FooB
{

T obj;

public Gen()
    {

}
    public Gen(T x, T y)
    {

Console.WriteLine("Gen(T x,T y)\t" + x.GetType().Name.ToString() + " " + y.GetType().Name.ToString());//+" "+obj.GetType().Name.ToString());

}

public void Display(T ob)
    {
        obj = ob;
        Console.WriteLine("Display  " + ob.GetType().Name.ToString() + " " + obj.GetType().Name.ToString());

//Fire the objests implementation of FooBase.FooMethod(FooBase obj)
        obj.FooMethod(obj);
    }

}

public class Program
{
    public static void Main(string[] args)
    {
        Gen<Foo> m = new Gen<Foo>();

Foo ob1 = new Foo();
        Foo ob2 = new Foo();
        Console.WriteLine("Main " + m.GetType());
        Console.WriteLine("Main " + ob1.GetType());
        Console.WriteLine();
        Gen<Foo> n = new Gen<Foo>(ob1, ob2);
        Console.WriteLine();
        m.Display(ob1);

//To stop the console
        Console.ReadLine();

}
}

}

Show compiler warnings [ + ] Show input
Compilation time: 0.08 sec, absolute running time: 10.02 sec, cpu time: 0.05 sec, average memory usage: 23 Mb, average nr of threads: 6