C# nested classes

A nested class is a class declared within another enclosing class. It is a member of its enclosing class, and members of the enclosing class cannot access members of the nested class.

Let’s look at an example code snippet of nested classes in C#.

Example

class One {
   public int num1;
   public class Two {
      public int num2;
   }
}
class Demo {
   static void Main() {
      One a = new One();
      a.num1++;
      One.Two ab = new One.Two();
      ab.num2++;
   }
}

This example shows that class Two is a nested class. Class two is contained within the class one declaration.

The class two here is included in the class one declaration. Therefore, the second class is a nested class. Because it has a public accessibility modifier, it can be accessed outside the scope of class One.

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