Non Generic object based class, 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
{
    
    class NonGen
    {

object ob; // ob is now of type object

// Pass the constructor a reference of type object.

public NonGen(object o)
 {
     ob = o;

}

// Return type object.

public object GetOb()
 {

return ob;

}

// Show type of ob.

public void ShowType()
 {

Console.WriteLine("Type of ob is " + this.GetOb().GetType().Name.ToString());

}

}
    public class Program
    {
        public static void Main(string[] args)
        {
            NonGen iOb;
            var v=0;
           //Type t=typeof(

// Create NonGen object.

iOb = new NonGen(102);

// Show the type of data stored in iOb.

iOb.ShowType();

// Get the value in iOb.

// This time, a cast is necessary.

v =(int)iOb.GetOb();

Console.WriteLine("value: " + v);

Console.WriteLine();

// Create another NonGen object and store a string in it.

NonGen strOb = new NonGen("Non-Generics Test");
            iOb=strOb;

// Show the type of data stored in strOb.

strOb.ShowType();

// Get the value of strOb.

// Again, notice that a cast is necessary.

String str = (string) strOb.GetOb();

Console.WriteLine("value: " + str);

// This compiles, but is conceptually wrong!

iOb = strOb;

// The following line results in a runtime exception.

// v = (int) iOb.GetOb(); // runtime error!
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0.08 sec, absolute running time: 0.06 sec, cpu time: 0.05 sec, average memory usage: 16 Mb, average nr of threads: 4