C# Online Compiler | .NET Fiddle

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;


    public class Program
    {
        public static void Main(string[] args)
        {
            A a = new A();
            B b = new B();

            Console.WriteLine("A.ble = \"" + a.GetPropValue("ble")+"\"");
            Console.WriteLine("B.test = \"" + b.GetPropValue("test")+"\"");
            //Thread.Sleep(5000);
        }
    }


    class A
    {
        public object GetPropValue(string propName)
        {
            Type t = this.GetType();

            if (t != null)
            {
                System.Reflection.PropertyInfo info = t.GetProperty(propName);
                if (info != null)
                    return info.GetValue(this, null);
                else
				{
					System.Reflection.FieldInfo info2 = t.GetField(propName);
					if(info2!=null)
						return info2.GetValue(this);
					else
						return "NULL";
				}
            }
            else
                return "TYPE IS NULL!";
        }
        public string ble = "A's property.";
    }
    class B : A
    {
        public string test = "B's property.";
    }

 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
​
​
    public class Program
    {
        public static void Main(string[] args)
        {
            A a = new A();
            B b = new B();
​
            Console.WriteLine("A.ble = \"" + a.GetPropValue("ble")+"\"");
            Console.WriteLine("B.test = \"" + b.GetPropValue("test")+"\"");
            //Thread.Sleep(5000);
        }
    }
​
​
    class A
    {
        public object GetPropValue(string propName)