What is the base class for all data types in C#.NET?

Object is the base class for all data types in C#. The Object Type is the ultimate base class for all data types in C# Common Type System (CTS). The object is an alias for System.Object class.

When a value type is converted to object type, it is called boxing and on the other hand, when an object type is converted to a value type, it is called unboxing.

The following is an example showing the usage of object data types −

using System;
using System.IO;

namespace Demo {
   class objectClass {
      public int x = 56;
   }

   class MyApplication {
      static void Main() {
         object obj;
         obj = 96;
         Console.WriteLine(obj);
         obj = new objectClass();
         objectClass newRef;
         newRef = (objectClass)obj;
         Console.WriteLine(newRef.x);
      }
   }  
}