You have nearly earned the record for lowest-effort post… congratulations!
Before you can even begin to reason about your issue, you need to fully understand this:
Value Types vs Reference Types:
If understanding those fundamentals fails to enlighten you, then this will ensure the highest chance that someone here can help you:
How to report your problem productively in the Unity3D forums:
http://plbm.com/?p=220
If you post a code snippet, ALWAYS USE CODE TAGS:
How to use code tags: Using code tags properly