Problem with list

Hi, ran on this silly problem, if I change list.count of Test1 to 5, when runing game both Test1.count and Test2.count in inspector become 4. This is simple version of code where i ran on this problem.
Why is not only Test2 chaning count.

Code (CSharp):

1.     public List<int> Test1;
2.     public List<int> Test2;
3.  
4.  
5.     void Start ()
6.     {
7.         Test2 = Test1;
8.          Test2.Remove(Test2[Test2.Count - 1]);
9.     }

 

Because this is a shallow copy, this means, you copy the reference, you don't duplicate it
To solve this, do new List<int>(Test1);

 

Test2 = Test1. List are reference types. You're not copying the list, you're setting Test2 to point to Test1. They both are the same referenced list.

@gorbit99 beat me to it.

 

Just found answer, but thanks and sory for stupid question.