Boxing and Unboxing in C#.Net

In this article, we will discuss boxing and unboxing in C#.Net. You can also check various posts on Session management in Asp.Net, Create datatable at runtime in Asp.Net and asp.net mvc 4 tutorial.

Boxing:
Boxing is the process of transforming a value type to a reference type. Basically, the runtime creates a temporary reference-type box for the object on the heap.

This can happen explicitly or implicitly.

Example:

int number = 20;
object objNumber = number;

Here integer number which is value type is converted to object type which is a reference type.

Unboxing:
Unboxing is the reverse process. Unboxing is the process of transforming a reference type to a value type.

But the reference type should be previously boxed. Here the value of a previously boxed value
type is cast back to a value type. And it should be done explicitly.


Here is a point to remember while doing unboxing: A variable can be unboxed only if it has been boxed.

int number = 10;
object objNumber = number; // Box the int
int number1 = (int)objNumber; // Unbox it back into an int


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About Bijay Kumar

I am Bijay from Odisha, India. Currently working in my own venture TSInfo Technologies in Bangalore, India. I am Microsoft Office Servers and Services (SharePoint) MVP (5 times). I works in SharePoint 2016/2013/2010, SharePoint Online Office 365 etc. Check out My MVP Profile.. I also run popular SharePoint web site SharePointSky.com

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