in c#, after I add a object to a collection, if another copy(deep copy) is always created?
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in c#, after I add a object to a collection, if another copy(deep copy) is always created?
No, if it is a class, most objects are, only a reference to the same object is stored in the collection.
If it is a value type, like int, double and structs a copy is made (not a deep copy, if the struct has a reference to a class object that in turn will not be copied).
Edit:
To deep copy objects you first need to create a deep copy function.
Have a look at Create a Deep Copy in C# or How to make a deep copy in C# ?
Then you can run your deep copy method before adding items to your collection.
Note
It is not very often you really need a true deep copy. Often it is better to rethink the dataflow in your application.