1: // This is one implementation of the abstract class PlugInForm as defined 
     2: //  in MyPlugIn.dll .
     3: // Compile with the command line:
     4: //  csc /t:library MPIMathMajor.cs /r:MyPlugIn.dll
     5: using System;
     6: public class MPIMathMajor : PlugInForm
     7: {
     8:   public override void WhatIsPI()
     9:   {
    10:     Console.WriteLine(Math.PI);
    11:   }
    12: }
    13: