Monogame Demo

using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;

public class Entry {
    static public int Main () {
        using (GameProper game = new GameProper()) {
                game.Run();
        }
        return 0;
    }
}

public class GameProper : Microsoft.Xna.Framework.Game {

    SpriteBatch spriteBatch;
    GraphicsDeviceManager graphics;

    private Texture2D background;
    private Texture2D shuttle;
    private Texture2D earth;

    public GameProper() {
        graphics = new GraphicsDeviceManager(this);
        Content.RootDirectory = "content";
    }

    protected override void LoadContent() {
        // Create a new SpriteBatch, which can be used to draw textures.
        spriteBatch = new SpriteBatch(GraphicsDevice);

        // This is the code we added earlier.
        background = Content.Load<Texture2D>("stars"); // change these names to the names of your images
        shuttle = Content.Load<Texture2D>("shuttle");  // if you are using your own images.
        earth = Content.Load<Texture2D>("earth");
    }

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

        spriteBatch.Begin();

        spriteBatch.Draw(background, new Rectangle(0, 0, 800, 480), Color.White);
        spriteBatch.Draw(earth, new Vector2(400, 240), Color.White);
        spriteBatch.Draw(shuttle, new Vector2(450, 240), Color.White);

        spriteBatch.End();

        base.Draw(gameTime);
    }
}