{
{1,1,1,1,1,1,1,1,1,1}
{0,0,0,0,0,0,0,0,0,0}
{0,0,0,0,0,0,0,0,0,0}
 }

class Game1 : Game
{
    GraphicsDeviceManager graphics;
    SpriteBatch spriteBatch;
    Texture2D gameBackround;
    SpriteFont font;
    int[,] map ;

    public Game1()
    {
        graphics = new GraphicsDeviceManager(this);
        Content.RootDirectory = "Content";
        graphics.PreferredBackBufferWidth = 1920;
        graphics.PreferredBackBufferHeight = 1080;
        graphics.GraphicsProfile = GraphicsProfile.HiDef;

    }




    protected override void LoadContent()
    {


        this.IsMouseVisible = true;
        gameBackround = Content.Load<Texture2D>("level_01_A");//this is the background

    map = new int[gameBackround.Width / 64, gameBackround.Height / 64];

        font = Content.Load<SpriteFont>("Fonts/Font");
        spriteBatch = new SpriteBatch(GraphicsDevice);
    }

      protected override void Draw(GameTime gameTime)
    {
        GraphicsDevice.Clear(Color.CornflowerBlue);
        spriteBatch.Begin();
        spriteBatch.Draw(gameBackround, new Rectangle(0, -700, 3840, 1984), Color.White);
        DrawGrid(map, spriteBatch, font);
        base.Draw(gameTime);
        spriteBatch.End();
    }

             public void DrawGrid(int[,] gameMap, SpriteBatch spriteBatch, SpriteFont f)
    {
        for (int x = 0; x < gameMap.GetLength(1); x++)
        {
            for (int y = 0; y < gameMap.GetLength(0); y++)
            {
                spriteBatch.DrawString(f, x + " / " + y, new Vector2(x * 64, y * 64), Color.White);
            }

        }

    }

var mouseState = Mouse.GetState();

if (mouseState.LeftButton == ButtonState.Pressed)
{
    // do something here
}

var xIndex = mouseState.X / 64;
var yIndex = mouseState.Y / 64;

map[xIndex, yIndex] = 1;

if (xIndex >= 0 && xIndex < map.GetLength(0) && yIndex >= 0 && yIndex < map.GetLength(1)) {
  map[xIndex][yIndex] = 1;
}

var mouseState = Mouse.GetState();

if (mouseState.LeftButton == ButtonState.Pressed)
{
  var xIndex = mouseState.X / 64;
  var yIndex = mouseState.Y / 64;

  if (xIndex >= 0 && xIndex < map.GetLength(0) && yIndex >= 0 && yIndex < map.GetLength(1)) {
    map[xIndex][yIndex] = 1;
  }
}