Problem inheriting class getting infinite loop

My main class has a Property in it that i need to access in my sub class.
But every time i try to inherit the main class i get a error from where its infinite loop.

Main Class:
C# | using System; using System.Collections.Generic; - Main class

Sub Class:
C# | using System.Diagnostics; using Microsoft.Xna.Fra - Sub Class

I don't see any inheritance going on, if it were, your property would probably need to be virtual. What is your exact error message and what line is it on?

An unhandled exception of type 'System.StackOverflowException' occurred in Project - Pro Racer.exe Line 17 in Engine.cs

updated code with inherit and virtual.

Main
C# | using System; using System.Collections.Generic; - Main Class

Sub
C# | using System.Diagnostics; using Microsoft.Xna.Fra - Sub Class

That usually means you have a recursive infinite loop. After looking at the code I think you will need to show us more pieces of it for us to help you. Line 17 makes no sense in either file unless some object you are passing as a param is causing the issue.