How to fix this error? I'm a beginner and am not sure how to fix with this method & class

Compilation failed: 1 error(s), 0 warnings
Program.cs(22,21): error CS1061: Type `SampleRPG.Player' does not contain a definition for `Defense' and no extension method `Defense' of type `SampleRPG.Player' could be found. Are you missing an assembly reference?
Player.cs(9,11): (Location of the symbol related to previous error)

///Program.cs
///4章

using System;

namespace SampleRPG
{
    class Program
    {
        static void Main(string[] args)
        {
            Player player1 = new Player();
            player1.name = 
            player1.hp = 100;

            Player player2 = new Player();
            player2.name = 
            player2.hp = 50;

            player1.Attack();
            player2.Defense();
        }
    }
}

///Player.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SampleRPG
{
    class Player
    {
        public int hp;  // HP
        public int name;

        // 攻撃メソッド
        public void Attack()
        {
            Console.WriteLine("敵の攻撃！");
        }

        // 逃走メソッド
        public void Escape()
        {
            Console.WriteLine("逃げられた！");
        }
    }
}