using System;
public class NamedPointTest
{
    public static void Main()
    {
        NamedPoint tNamedPoint = new NamedPoint("first", 100, 200);
        Console.WriteLine(tNamedPoint);
        Point tPoint = tNamedPoint;
        Console.WriteLine(tPoint);
    }
}

Public Class Point
    Private iX As Integer
    Private iY As Integer
    Public Sub New(ByVal pX As Integer, ByVal pY As Integer)
        iX = pX
        iY = pY
    End Sub
    Public Overrides Function ToString() As String
        Return iX & ":" & iY
    End Function
End Class

Module PointTest
    Sub Main()
        Dim tPoint As Point = New Point(100, 200)
        Console.WriteLine(tPoint)
        Dim tAnotherPoint As Point = tPoint
        Console.WriteLine(tAnotherPoint)
    End Sub
End Module

Public Class NamedPoint
    Inherits Point
    Private iName As String
    Public Sub New(ByVal pName As String, ByVal pX As Integer, ByVal pY As Integer)
        MyBase.New(pX, pY)
        iName = pName
    End Sub
    Public Overrides Function ToString() As String
        Return iName & "%" & MyBase.ToString()
    End Function
End Class

Module NamedPointTest
    Sub Main()
        Dim tNamedPoint As NamedPoint = new NamedPoint("first", 100, 200)
        Console.WriteLine(tNamedPoint)
        Dim tPoint As Point = tNamedPoint
        Console.WriteLine(tPoint)
    End Sub
End Module

We have now provided 4 classes in C#:

• Point
• PointTest
• NamedPoint
• NamedPointTest

If it were necessary, a mix of .NET languages could be used. For example, we could use a NamedPointTest class coded in C# with a NamedPoint class coded in VB.NET and a Point class coded in C#.