using System;

​

public class Example

{

   public static void Main()

   {

      var a = new AdapterPresentationCustomBiometric2019();

      Type t = a.GetType();

      Console.WriteLine();

      Console.WriteLine("Type: " + t + " is assignable " + t.IsAssignableFrom(typeof(BaseMFAPresentation)));  

      Console.WriteLine("IsClass: " + t.IsClass);

      Console.WriteLine("!IsAbstract: " + !t.IsAbstract); 

      Console.WriteLine("Class BaseType: " + t.BaseType);

      Console.WriteLine("BaseType is assignable from BasePresentation: " + t.BaseType.IsAssignableFrom(typeof(BasePresentation)));

      Console.WriteLine("BaseType is assignable from BaseMFAPresentation: " + t.BaseType.IsAssignableFrom(typeof(BaseMFAPresentation)));

   }

}

​

public abstract class BasePresentation

{

    public BasePresentation() {Console.WriteLine("base");}

}

public abstract class BaseMFAPresentation: BasePresentation

{

    public BaseMFAPresentation() : base() {Console.WriteLine("base MFA");}

}

public abstract class AdapterPresentationCustomBiometricBase : BaseMFAPresentation

{

    public AdapterPresentationCustomBiometricBase() : base() {Console.WriteLine("custom base");}

}

 public class AdapterPresentationCustomBiometric2019 : AdapterPresentationCustomBiometricBase

 {

     public AdapterPresentationCustomBiometric2019() : base() {Console.Write("2019");}

 }