Time for action – the Game1 Update method

1. Replace the current Update() method in the Game1 class with the following:

   protected override void Update(GameTime gameTime)
   {
       Camera.Position = new Vector2(hscroll.Value, vscroll.Value);
   
       MouseState ms = Mouse.GetState();
   
       if ((ms.X > 0) && (ms.Y > 0) &&
           (ms.X < Camera.ViewPortWidth) &&
           (ms.Y < Camera.ViewPortHeight))
       {
           Vector2 mouseLoc = Camera.ScreenToWorld(
               new Vector2(ms.X, ms.Y));
   
           if (Camera.WorldRectangle.Contains(
               (int)mouseLoc.X, (int)mouseLoc.Y))
           {
             if (ms.LeftButton == ButtonState.Pressed)
             {
               TileMap.SetTileAtCell(
                 TileMap.GetCellByPixelX((int)mouseLoc.X),
                 TileMap.GetCellByPixelY((int)mouseLoc.Y),
                 DrawLayer,
                 DrawTile);
             }
   
             if ((ms.RightButton == ButtonState.Pressed) &&
                 (lastMouseState.RightButton...