Why doesn't this code work?

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;

namespace XNA_Pong
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        
        Texture2D texBall;
      
        Paddle P1 = new Paddle();
        Paddle P2 = new Paddle();

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
            graphics.IsFullScreen = false;
            graphics.PreferredBackBufferHeight=500;
            graphics.PreferredBackBufferWidth = 500;
        }

        /// <summary>
        /// Allows the game to perform any initialization it needs to before starting to run.
        /// This is where it can query for any required services and load any non-graphic
        /// related content.  Calling base.Initialize will enumerate through any components
        /// and initialize them as well.
        /// </summary>
        protected override void Initialize()
        {
            // TODO: Add your initialization logic here


            base.Initialize();
        }

        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            //Assigning Paddle Textures
            spriteBatch = new SpriteBatch(GraphicsDevice);
          P1.tex = Content.Load<texture2d>("Player1");
            P2.tex = Content.Load<texture2d>("Player2");
            texBall = Content.Load<texture2d>("Pong Ball");

            P1.position.X = 10;
            P1.position.Y = graphics.GraphicsDevice.Viewport.Height / 2 - (P1.height / 2);

            P2.position.X = graphics.GraphicsDevice.Viewport.Width - 20 - (P2.width);
            P2.position.Y = graphics.GraphicsDevice.Viewport.Height / 2 - (P2.height / 2);
            // TODO: use this.Content to load your game content here
        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// all content.
        /// </summary>
        protected override void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
        }

        /// <summary>
        /// Allows the game to run logic such as updating the world,
        /// checking for collisions, gathering input, and playing audio.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Update(GameTime gameTime)
        {
            // Allows the game to exit
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            // TODO: Add your update logic here

            base.Update(gameTime);
        }

        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.Black);

            // TODO: Add your drawing code here
            spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend);
                      spriteBatch.Draw(texBall, new Vector2(250f, 250f), Color.White);
            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;
namespace XNA_Pong{


    class Paddle : Microsoft.Xna.Framework.Game
    {
        public Texture2D tex;
        public Vector2 position;
        public PlayerIndex Pnumber;
        public int width, height, speed;

        public Paddle()
        {
            tex = null;
            position = Vector2.Zero;
            Pnumber= PlayerIndex.One;
            width = 10;
            height = 50;
            speed = 20;

        }
        public void Update()
        {
        }
        public void Draw(SpriteBatch spriteBatch);
        spriteBatch.Draw(tex, position, Color.White);     
    }
}