Root class in .Net

In .NET, the "Root class" typically refers to the most fundamental and base class in the hierarchy of all classes within the .NET framework. This class is the root of the inheritance tree, from which all other classes are derived. The root class serves as a foundation upon which all other classes are built, and it provides essential functionalities and characteristics inherited by all other classes in the .NET ecosystem.

In C#, the root class is represented by the System.Object class. Every class in C# automatically derives from System.Object unless it explicitly specifies a different base class. The System.Object class is defined in the mscorlib.dll assembly and resides within the System namespace.

Key aspects of the System.Object

Methods and Properties

The System.Object class defines several critical methods and properties that are inherited by all other classes. Some of the commonly used methods include:

  1. ToString(): Returns a string representation of the object.
  2. Equals(Object obj): Determines whether the current object is equal to the specified object.
  3. GetHashCode(): Returns a hash code for the object, used in hashing and collection classes.
  4. GetType(): Retrieves the Type of the current instance.

Boxing and Unboxing


Another crucial concept related to the root class is boxing and unboxing. When a value type (e.g., int, double, etc.) is assigned to a variable of type System.Object, it undergoes "boxing," which means it gets converted to an object. Conversely, when the value is extracted from the object and assigned to a value type variable, it undergoes "unboxing."

Implicit Base Class

If a class is defined without explicitly specifying a base class, it implicitly inherits from System.Object.

class MyClass // This class implicitly derives from System.Object { // Class members and methods }

Object Reference

Every object in .NET, regardless of its class, can be treated as an instance of the System.Object class. This allows for certain common functionalities to be performed on all objects, such as accessing the ToString() method or checking for equality using Equals().

object myObject = new MyClass(); // myObject is a reference to an instance of MyClass string str = myObject.ToString(); // Accessing the ToString() method of System.Object


The root class in .NET is represented by the System.Object class. It serves as the base for all classes in the .NET framework, providing essential methods and properties that are inherited by all other classes. Understanding the significance of the root class is crucial for effectively utilizing common functionalities and behaviors available to all objects in the .NET ecosystem.