code is as follows, mainly looking at the last

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

namespace CSharpClassTest
{
    /*
     * :https://blog.csdn.net/tc_1337/article/details/80957140-sharpcommentsedit
     */

    class A
    {
        public static string StaticStr = "A ";
        public string NonStaticStr = "A ";

        public string NoStaticProperty { get; set; } = "A ";

        public static void StaticMethod()
        {
            Console.WriteLine("A ");
        }

        public void NonStaticMethod()
        {
            Console.WriteLine($"A :A  | A :{NonStaticStr} | {NoStaticProperty}");
        }

    }

    class B : A
    {

        public static string StaticStr = "B ";
        public string NonStaticStr = "B ";

        public static void StaticMethod()
        {
            Console.WriteLine("B ");
        }

        public void NonStaticMethod()
        {
            Console.WriteLine($"B :{NonStaticStr}");
        }

    }

    class C : A
    {

    }

    class D : A
    {
        public string NonStaticStr = "D ";
    }

    class E : A
    {
        public string NoStaticProperty { get; set; } = "E ";
    }

    class Program
    {
        static void Main(string[] args)
        {
            C c = new C();
            Console.WriteLine(" AC :");
            Console.WriteLine(c.NonStaticStr);      // A 
            c.NonStaticMethod();                    // A :A  | A 
            Console.WriteLine("-------------------------------\r\n");

            A c1 = new C();
            Console.WriteLine(" CA :");
            Console.WriteLine(c1.NonStaticStr);     // A 
            c1.NonStaticMethod();                   // A :A  | A 
            Console.WriteLine("-------------------------------\r\n");

            B b = new B();
            Console.WriteLine(" AB :");
            Console.WriteLine(b.NonStaticStr);      // B 
            b.NonStaticMethod();                    // B :B 
            Console.WriteLine("-------------------------------\r\n");

            A b1 = new B();
            Console.WriteLine(" BA :");
            Console.WriteLine(b1.NonStaticStr);     // A 
            b1.NonStaticMethod();                   // A :A  | A 
            Console.WriteLine("-------------------------------\r\n");

            D d = new D();
            Console.WriteLine(" AD :");
            Console.WriteLine(d.NonStaticStr);     // D 
            d.NonStaticMethod();                   // A :A  | A 
            Console.WriteLine("-------------------------------\r\n");

            E e = new E();
            Console.WriteLine(" AE :");
            Console.WriteLine(e.NoStaticProperty); // E 
            e.NonStaticMethod();                   // A :A  | A 
            Console.WriteLine("-------------------------------\r\n");
        }
    }
}

inspired by @ Woody :

    class AA
    {
        public virtual string NoStaticProperty { get; set; } = "AA ";

        public void NonStaticMethod()
        {
            Console.WriteLine($"AA : :{NoStaticProperty}");
        }

    }

    class BB : AA
    {
        public override string NoStaticProperty { get; set; } = "BB ";
    }

    class CC : AA
    {
        public new string NoStaticProperty { get; set; } = "CC ";
    }
    
    //...
    
BB bb = new BB();
Console.WriteLine(" AABB :");
Console.WriteLine(bb.NoStaticProperty); // BB 
bb.NonStaticMethod();                   // AA : :BB 
Console.WriteLine("-------------------------------\r\n");

CC cc = new CC();
Console.WriteLine(" newAACC :");
Console.WriteLine(cc.NoStaticProperty); // CC 
cc.NonStaticMethod();                   // AA : :AA 
Console.WriteLine("-------------------------------\r\n");

AA ab = new BB();
Console.WriteLine(" BBAA :");
Console.WriteLine(ab.NoStaticProperty); // BB 
ab.NonStaticMethod();                   // AA : :BB 
Console.WriteLine("-------------------------------\r\n");