Difference between in Reference and Value Data Type

• Value Types
  

• Value types hold the data directly.
• Value types do not have default value.
• Value types will be stored in stack memory at compile time.
• Stack is faster in accessing
• Stack is not accessible to garbage collector. Hence it will not be cleared at runtime.
• Value type passes an exact copy to methods.
• Example: Implicit Data Types, Structures, Enumerations.

• Reference Types

• Reference types do not hold the date directly.
• Reference types have default value.
• Reference types will be stored in heap memory at run-time.
• Heap is slower in accessing.
• Heap is accessible to garbage collector. Hence at run-time heap can be cleared.
• Reference types passes a reference (handle) to methods.
• Example: Classes, Objects, Arrays, Delegates, Interfaces.

Read about Data types