継承したメンバーはどう見えるかとか。

Program.cs

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

	class Program{
		public class A{
			protected string member = "class a's member";
			public virtual string method_a(){
				return "class A method a\t" + this.member;
			}
		}
		public class B:A{
			private string member = "class b's member";
			public override string method_a ()
			{
				return "class B method a\t" + this.member;
			}
		}
		public class C:B{
			//string member = "class c's member";
			public override string method_a ()
			{
				return "class C method a\t" + this.member;
			}
		}
		static void Main (string[] args) {
			A a = new A ();
			B b = new B ();
			C c = new C ();
			StringBuilder sb = new StringBuilder ();
			sb.AppendLine (a.method_a());
			sb.AppendLine (b.method_a());
			sb.AppendLine (c.method_a());
			Console.WriteLine (sb.ToString());
		}
	}