Question

My understanding is that it is possible to Override a method (marked as Virtual) in a base class from a derived class using the keywords override.

But what about overriding a method in the same class?

In my specific case, I have a class x with 2 methods. Method a has some common behavior with b, and b adds functionality to method a.

In the past, I have duplicated the code of a in b and added the new functionality into b.

I would like to know if there is a better approach so I can centralize the behavior of method a.

    public class x
    {
       public static void a() {}
       public static void b() {}         
    }

Answer 1

You could simply call your method a() from within your method b(). No need (and no way) to override a method.

public class x
{
   private static int _i = 0;

   public static void a() {
       _i = 1;
   }
   public static void b() {
       a();
       // here is _i = 1;
   }         
}

On the other hand you could have parameter overloads for your method.

public class x
{
   private static int _i = 0;

   public static void a() {
       a(1);
   }
   public static void a(int i) {
      _i = t;
      // common code which can use _i
   }         
}

In this case you can call a(1) or a() with the same result.