Urgent Help with C# code

[Bondy007]

Hey Everyone, My first post here

I relli just need some help with a project ive been working on. its to do with object orientated development in C#. anyway ive hit a wall and i cannot get past it. im getting a stack overflow error when i start the complier. and program wont run properly. im after some urgent help on this for anyone who can. Ive attached my Code so far if someone could give us a heads up on what im doing wrong id be very grateful

Cheers,
Bondy