What is boxing and unboxing?

Boxing is the process of converting value type to the type object.Actually the copy of value type copied from stack to heap memory.
Unboxing is the process of converting obect type to value type.The value from heap memory back to stack memory.
   
    int i = 123;      // a value type
    object o = i;     // boxing
    int j = (int)o;   // unboxing

Value Types in .net are  all numeric values (like int, double etc),Boolean,Char and Date,structures,Enumerations
Value Types stored on the stack.
Reference Types are String,Arrays even if their members are refernce types,classes and delegates.
Reference Types stored on the managed heap.

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