Journey of Windows 8 Game (SkyWar) for Intel App Up Using MonoGame Framework

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SkyWar
{
    public class Background
    {
        Texture2D t2dBackground, t2dParallax;
        GameData _gameData = null;
        int iViewportWidth = 800;
        int iViewportHeight = 600;

        int iBackgroundWidth = 1600;
        int iBackgroundHeight = 1080;

        int iParallaxWidth = 1600;
        int iParallaxHeight = 1080;

        int iBackgroundOffset;
        int iParallaxOffset;
        public int BackgroundOffset
        {
            get { return iBackgroundOffset; }
            set
            {
                iBackgroundOffset = value;
                if (iBackgroundOffset < 0)
                {
                    iBackgroundOffset += iBackgroundHeight;
                }
                if (iBackgroundOffset > iBackgroundHeight)
                {
                    iBackgroundOffset -= iBackgroundHeight;
                }
            }
        }

        public int ParallaxOffset
        {
            get { return iParallaxOffset; }
            set
            {
                iParallaxOffset = value;
                if (iParallaxOffset < 0)
                {
                    iParallaxOffset += iParallaxHeight;
                }
                if (iParallaxOffset > iParallaxHeight)
                {
                    iParallaxOffset -= iParallaxHeight;
                }
            }
        }

        bool drawParallax = true;

        public bool DrawParallax
        {
            get { return drawParallax; }
            set { drawParallax = value; }
        }

        public Background(ContentManager content, string sBackground, string sParallax)
        {
            _gameData = GameData.GetGameDataInstance();
            iViewportHeight = _gameData.GameScreenHeight;
            iViewportWidth = _gameData.GameScreenWidth;
            t2dBackground = content.Load<Texture2D>(sBackground);
            _gameData.BackgroundWidth = iBackgroundWidth = t2dBackground.Width;
            _gameData.BackgroundHeight = iBackgroundHeight = t2dBackground.Height;
            t2dParallax = content.Load<Texture2D>(sParallax);
            iParallaxWidth = t2dParallax.Width;
            iParallaxHeight = t2dParallax.Height;
        }
        public Background(ContentManager content, string sBackground)
        {
            _gameData = GameData.GetGameDataInstance();
            iViewportHeight = _gameData.GameScreenHeight;
            iViewportWidth = _gameData.GameScreenWidth;
            t2dBackground = content.Load<Texture2D>(sBackground);
            _gameData.BackgroundWidth = iBackgroundWidth = t2dBackground.Width;
            _gameData.BackgroundHeight = iBackgroundHeight = t2dBackground.Height;
            t2dParallax = t2dBackground;
            iParallaxWidth = t2dParallax.Width;
            iParallaxHeight = t2dParallax.Height;
            drawParallax = false;
        }

        public void Draw(SpriteBatch spriteBatch)
        {
            // Draw the background panel, offset by the player's location
            spriteBatch.Draw(t2dBackground, new Rectangle(0, -1 * iBackgroundOffset, iViewportWidth, iBackgroundHeight), Color.White);

            // If the right edge of the background panel will end 
            // within the bounds of the display, draw a second copy 
            // of the background at that location.
            if (iBackgroundOffset > iBackgroundHeight - iViewportHeight)
            {
                spriteBatch.Draw(t2dBackground, new Rectangle(0, (-1 * iBackgroundOffset) + iBackgroundHeight, iViewportWidth, iBackgroundHeight), Color.White);
            }

            if (drawParallax)
            {
                // Draw the parallax star field
                spriteBatch.Draw(t2dParallax, new Rectangle(0, -1 * iParallaxOffset, iViewportWidth, iParallaxHeight), Color.SlateGray);
                // if the player is past the point where the star 
                // field will end on the active screen we need 
                // to draw a second copy of it to cover the 
                // remaining screen area.
                if (iParallaxOffset > iParallaxHeight - iViewportHeight)
                {
                    spriteBatch.Draw(t2dParallax, new Rectangle(0, (-1 * iParallaxOffset) + iParallaxHeight, iViewportWidth, iParallaxHeight), Color.SlateGray);
                }
            }
        }
    }
}