Namespaces multiple, 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;
using Example.NameSpaceExample;
    using NameSpaceExample2;
namespace Example
{
namespace NameSpaceExample
{
	class CountDown
	{

int val;

public CountDown(int n)
		{

val = n;

}

public void Reset(int n)
		{

val = n;

}

public int Count() 
		{

if(val > 0) return val--;

else return 0;

}

}
	
}

}
namespace NameSpaceExample2
{
	class CountDown
	{

int val;

public CountDown(int n)
		{

val = n;

}

public void Reset(int n)
		{

val = n;

}

public int Count() 
		{

if(val > 0) return val--;

else return 0;

}

}
	
}

namespace Rextester
{
	
	
	public class Program
	{
		public static void Main(string[] args)
		{
			// Notice how CountDown is qualified by Counter.

//NameSpaceExample.CountDown cd1 = new NameSpaceExample.CountDown(10);
            Example.NameSpaceExample.CountDown cd1=new  Example.NameSpaceExample.CountDown(10);

int i;

do {

i = cd1.Count();

Console.Write(i + " ");
     
     } while(i > 0);

Console.WriteLine();

// Again, notice how CountDown is qualified by Counter.

Example.NameSpaceExample.CountDown cd2 = new Example.NameSpaceExample.CountDown(20);

do {

i = cd2.Count();

Console.Write(i + " ");

} while(i > 0);

Console.WriteLine();

cd2.Reset(4);

do {

i = cd2.Count();

Console.Write(i + " ");

} while(i > 0);

Console.WriteLine();

}
	}
}

Show compiler warnings [ + ] Show input
Compilation time: 0.08 sec, absolute running time: 0.06 sec, cpu time: 0.03 sec, average memory usage: 16 Mb, average nr of threads: 4