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C#-Quelltext

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 Small_Shooter
{
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;

        Song bgm;

        Texture2D player;

        Rectangle player_rect;
        Rectangle bullet_rect;

        SpriteFont steuerung;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";

            graphics.PreferredBackBufferWidth = 1280;
            graphics.PreferredBackBufferHeight = 768;

            IsMouseVisible = true;

            player_rect.X = 600;
            player_rect.Y = 384;
        }

        protected override void Initialize()
        {
            base.Initialize();
        }

        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);
            player = Content.Load<Texture2D>("player");
            steuerung = Content.Load<SpriteFont>("steuerung");

            player_rect.Height = player.Height;
            player_rect.Width = player.Width;
        }

        protected override void UnloadContent()
        {

        }

        protected override void Update(GameTime gameTime)
        {
            KeyboardState kState = Keyboard.GetState();
            //Steuerung
            if (kState.IsKeyDown(Keys.A))
            {
                player_rect.X -= 5;
            }
            if (kState.IsKeyDown(Keys.D))
            {
                player_rect.X += 5;
            }
            if (kState.IsKeyDown(Keys.S))
            {
                player_rect.Y += 5;
            }
            if (kState.IsKeyDown(Keys.W))
            {
                player_rect.Y -= 5;
            }
            //Rand Kollision
            if (player_rect.X < 0)
            {
                player_rect.X = 0;
            }
            if (player_rect.X + player.Width > graphics.PreferredBackBufferWidth)
            {
                player_rect.X = graphics.PreferredBackBufferWidth - player.Width;
            }
            if (player_rect.Y < 0)
            {
                player_rect.Y = 0;
            }
            if (player_rect.Y + player.Width > graphics.PreferredBackBufferHeight)
            {
                player_rect.Y = graphics.PreferredBackBufferHeight - player.Height;
            }
            //Bullet
            if (kState.IsKeyDown(Keys.Left))
            {
                bullet_rect.X -= 5;
            }

            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            spriteBatch.Begin();
            spriteBatch.DrawString(steuerung, "Steuerung: W, A, S, D", new Vector2(5, 5), Color.White);
            spriteBatch.Draw(player, player_rect, Color.White);
            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}