using System;

​

// define a namespace

namespace Test

{

    public class MyClass

    {

        public static MyClass Instance { get; } = new MyClass();

        private MyClass(){}

        public override string ToString() => "This is Test.MyClass";

    }

}

​

// define another namespace which has a class called MyClass

namespace Test2

{

    public class MyClass

    {

        public static MyClass Instance { get; } = new MyClass();

        private MyClass(){}

        public override string ToString() => "This is Test2.MyClass";

    }

}

​

// going back to same namespace "Test" and extending on it

namespace Test.Ops1

{   

    public class ConsumerClass

    {

        // this will use Test.MyClass and it does not need "using Test" because current namespace includes it

        public override string ToString() => $"{MyClass.Instance}";

    }

}

​

// going back to same namespace "Test" and extending on it

namespace Test.Ops2

{

    using Test2;

    public class ConsumerClass

    {

        // this will use Test2.MyClass

        public override string ToString() => $"{MyClass.Instance}";

    }

}

​

public class Example

{

    public static void Main()

    {

        Console.WriteLine(new Test.Ops1.ConsumerClass());

        Console.WriteLine(new Test.Ops2.ConsumerClass());

    }

}