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What is Boxing and Unboxing?

Topic Name Introduction to C# Environment Setup C# Keywords Contextual Keywords C# Namespaces What Is Class? What is Object? Data Types Nullable Types C# Variables What are Access Modifiers? What is Property? What is Indexer? Hello world Program What is Type conversion? What is if else condition? What is Array? What is Jagged Array? What is ArrayList? What is List? What is string and StringBuilder? What is for loop? What is foreach loop? What is switch? What is Method? What is method overloading? What is Constructor? What is constructor overloading? What is Boxing and Unboxing? What is delegate in C# and uses of delegates? What is Inheritance? What are Value types and Reference types? What is Exception Handling? What is struct? What is Dictionary? What is Hashtable? What is interface? What is Abstraction? What is Polymorphism? What is Enums? What is Sealed Class? What is Partial Class? Extension Methods? What is static? What is Encapsulation? Difference between Equality Operator (==) and Equals() Method in C# ? What is IEnumerable? What is Serializing? What is LINQ? Differences between IEnumerable and IQueryable? What is Multithreading? What is File Handling? What is late binding and early binding? What is Singleton Design Patterns?
1/8/2020 7:19:08 AM

Boxing: Implicit conversion a value type to a reference type is called boxing. In boxing process, a value type is being allocated on the heap rather than the stack.

Unboxing: Explicit conversion of the same reference type (which is being created by boxing), back to a value type. In unboxing process, an unboxed value being allocated to a variable on the stack rather then the heap. Now given bellow the code and explain the code:

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using testForClass1;

namespace testFor
{
    public class Program 
    {
        static void Main(string[] args)
        {
            object obj = new object();
            int myValue = 102;
            obj = myValue; // Boxing
            Console.WriteLine("Boxing Value : "+obj);
            int myValueTwo =(int)obj;//Unboxing
            Console.WriteLine("Unboxing Value : " + myValueTwo);
            Console.Read();
        }
    }
}

Object is a C# base class. All class inherit by object class, now we create object class obj then int value assign the object. We know object is reference type and int is value type. When we assign the value type into reference type it called boxing. Again, when we reference type to assign it’s called unboxing.

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