Boxing and unboxing in C#

Boxing

Boxing is the implicit conversion of a value type to a reference type.

Unboxing

Unboxing is the explicit conversion of the reference type created by boxing back to a value type.

Example

Let’s see a sample code snippet -

// int
int myVal = 12;
// Boxing
object myBoxed = myVal;
// Unboxing
int myUnBoxed = (int) myBoxed;

Let’s see another example of displaying an array list in C# -

int a = 5;
ArrayList arr = new ArrayList();
// Boxing
arr.Add(a);
// UnBoxing
int b = (int)arr[0];

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