All 18 Memory & Garbage Collection questions
More in Memory & Garbage Collection
How does garbage collection work in .NET? What is the difference between managed and unmanaged resources? What are .NET's garbage collection 'generations,' and what's the core assumption behind this design? How does garbage collection in .NET work, and what three phases does a collection cycle go through? What is the IDisposable pattern and why implement it? What is the difference between a finalizer and Dispose? How does the IDisposable pattern and the 'using' statement help manage UNMANAGED resources that the garbage collector doesn't automatically clean up? What is a memory leak in a garbage-collected language like C#, given that the GC handles cleanup automatically? What is boxing and unboxing, and why does it have a real performance cost? What is the difference between Dispose and Finalize in C#, and when should each actually be used?
Advertisement
C# › Memory & Garbage Collection

What is the difference between the stack and the heap in .NET memory management?

Beginner

Answer

The stack stores value-type local variables and method call frames, with fast, automatic, LIFO-ordered allocation/deallocation tied to method scope; the heap stores reference-type objects (and boxed value types), with allocation managed by the .NET runtime and deallocation handled by the garbage collector, not tied to any particular method's scope.
void Method() {
  int x = 5;              // value type: allocated on the stack
  var person = new Person(); // reference type: 'person' variable on stack, actual object on the heap
} // 'x' and the 'person' reference are popped off the stack when Method() returns
Real-world example Understanding why a local int variable is instantly reclaimed on method return, while a 'new Person()' object survives until the GC decides to collect it.

Common follow-ups: Why can objects on the heap potentially survive LONGER than the method call that created them?

Value vs Reference Types
All 18 Memory & Garbage Collection questions