If by string you mean array of char then it's perfectly possible to stack allocate an array of char in C#. http://msdn.microsoft.com/en-us/library/aa664785(v=v

If by string you mean array of char then it's perfectly possible to stack allocate an array of char in C#. http://msdn.microsoft.com/en-us/library/aa664785(v=vs.71).aspx http://msdn.microsoft.com/en-us/library/aa664785(v=vs.71).as... And seriously, it's not like everything in the linux kernel is stack allocated. The stack runs out of memory as well so it's not as if stack allocation is some magical place with out resource constraints. Since we deal with processors with caches and lots of other variable timing issues you don't even really get deterministic timing either.