C#InTheConsoleAthlete

// All these files were created with simple notepad in the console.
// type: notepad Program.cs and type the program
// set Path=%Path%;C:\WINDOWS\Microsoft.NET\Framework\v3.5
// echo %Path%
// 1. use to compile with other files (everythign in one assembly): csc /t:exe /out:Program.exe *.cs

// 2. or create a library dll and use reference
// 2.1. csc /t:library /out:People.dll Person.cs Student.cs Athlete.cs
// make all classes public othervise they are internal
// 2.2. csc /reference:People.dll /t:exe /out:ProgramRef.exe Program.cs

using System;

namespace Stoyan
{
    // class Athlete : Person
    public class Athlete : Person
    {
        public string Sport {get; set;}
        public Athlete(string name, int age, string sport)
            :base(name, age)
        {
            Sport = sport;
        }

        // hiding. If there is upcasting the hided method will be executed
        public new void IntroduceYourSelf()
        {
            Console.WriteLine("I am a student");
            base.IntroduceYourSelf();
            Console.WriteLine("Sport= {0}", Sport);
        }
    }
}

/*
http://stackoverflow.com/questions/14728422/c-sharp-importing-class-into-another-class-doesnt-work

using is for namespaces only - if both classes are in the same namespace just drop the using.

You have to reference the assembly created in the first step when you compile the .exe:

csc /t:library /out:MyClass.dll MyClass.cs
csc /reference:MyClass.dll /t:exe /out:MyProgram.exe MyMainClass.cs
You can make things simpler if you just compile the files together:

csc /t:exe /out:MyProgram.exe MyMainClass.cs MyClass.cs
or

csc /t:exe /out:MyProgram.exe *.cs
EDIT: Here's how the files should look like:

MyClass.cs:

namespace MyNamespace {
    public class MyClass {
        void stuff() {

        }
    }
}
MyMainClass.cs:

using System;

namespace MyNamespace {
    public class MyMainClass {
        static void Main() {
            MyClass test = new MyClass();
        }
    }
}

*/