Properties of linked lists

[Executionerr]

Hello, it seems I am having some difficulties with my project in witch I am training my C# skills.
Well, the problem is I have wrote the biggest part of the code, but I have problem to finish what i started, so I left blank code lines.

Here is a link of the solution I am currently working on, if you have anytime, any additions to my code are welcome, you can e-mail me a new solution at :

I believe the comments are enough to help you understand what I am doing :

https://rapidshare.com/files/459470853/Project_2011.rar

Thanks in advance.

[RunTimeError]

I have no idea where in your code your having problems.

Can you please describe the issues you are having and perhaps post in code tags the area in your code where you are having problems?