Quote:
I represent the garage with a list. I put values to one instance and add it to the list, then I realize that when I start to add values to a new instance, it changes the values of the instance inside the list.
Even without code, one can say is that what you think is 2 instances of 2 different things is in fact 2 pointers to same instance, thus the problem.
Along with deeper learning of programming techniques, you should learn debugger.
When you don't understand what your code is doing or why it does what it does, the answer is
debugger.
Use the debugger to see what your code is doing. It allow you to execute lines 1 by 1 and to inspect variables as it execute, it is an incredible learning tool.
Debugger - Wikipedia, the free encyclopedia[
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Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[
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The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.