anonymous class means its does not have a tag name.
as you  know that...
when u declare the class
class Tcs
{
......
....
}
But its not anonymous class because it has class name(tag);
if u declare like that
class
{
............
.........
}
then its called aonymous class

Suppose 

Class My implements InetrfaceName{

My my=new InterfaceName(){ write mehtod impl here of 
interface};

here we r creating instance of class (we dont know name)to 
my

hi ,
look into this 


Anonymous type is the type that is created anonymously. 
Anonymous type is a class that is created automatically by 
compiler in somewhere you can’t see directly while you are 
declaring the structure of that class. Confusing? Let me 
show you one example.

view plaincopy to clipboardprint?
  
using System;   
using System.Collections.Generic;   
using System.Linq;   
using System.Text;   
  
namespace ConsoleApplication1 {   
class Program {   
static void Main(string[] args) {   
Person _person = new Person { ID = 1, FirstName 
= "Michael", LastName = "Sync" };   
Console.WriteLine("Name: {0} {1}", _person.FirstName, 
_person.LastName);   
Console.ReadLine();   
}   
}   
public class Person {   
public int ID { get; set; }   
public string FirstName { get; set; }   
public string LastName { get; set; }   
}   
}  

anonymous class are inner classes that cant not  have a
class name and constructor also.

anonymous class is a class which is defined on run time 
that it;