variable reference in array... strings?

[Jhd.Honza]

Hi,
I am trying to access a variable I have stored in ListArray. If I use classes, like this:

 MyClass mc = new MyClass();
 MyListArray.Add("mc",mc);
 mc.MyValue = 4;

everything works, and ((MyClass)MyListArray["mc"]).MyValue is 4.

However, if I store string (or eg. TimeSpan) like this, (object MyString = "") I can not modify it without creating new copy... and MyString contains something else than (string)MyArray["MyString"]

How to access my string variable by name?

Do I have to create my own class for every variable I cannot modify without creating copy?