// This is one implementation of the abstract class PlugInForm as defined 
//  in MyPlugIn.dll .
// Compile with the command line:
//  csc /t:library MPIMathMajor.cs /r:MyPlugIn.dll
using System;
public class MPIMathMajor : PlugInForm
{
  public override void WhatIsPI()
  {
    Console.WriteLine(Math.PI);
  }
}