problem accessing dlls within another assembly in C#.NET

Question

Though this is soooo simple I m not finding a solution for this.

I created a Class Library GoodBye

namespace Greet

{

public class GoodBye

{

public void sayHello()

{

Console.WriteLine("GoodBye");

}

}

}

Then another ClassLibrary Hello as:

amespace Greet

{

public class Hello

{

public void sayHello()

{

Console.WriteLine("Hello");

}

}

}

Then another assembly GreetAssembly with reference to the both Hello and Goodbye dlls as:

using System;

using System.Collections.Generic;

using System.Text;

using Greet;

namespace GreetAssembly

{

public class GreetAssembly

{

}

}

then I created a Console appln with a reference to GreetAssembly as:

using System;

using System.Collections.Generic;

using System.Text;

using GreetAssembly;

namespace Calling_Program

{

class Program

{

static void Main(string[] args)

{

// Code to be written to access Hello and GoodBye class methods with the GreetAssembly
// namespace

}

}

}

I want to access the Hello and GoodBye and their methods from the Main of Program class.But I am not able to do it?!?!?!!?I have reference to GreetAssembly which has those dlls!!!! But I am not able to.

Can anyone help me clear this basic doubt?!?!?!