System.Collections.ArrayList.AddRange C# (CSharp) Method

        public virtual void AddRange(ICollection c)
        {
            InsertRange(_size, c);
        }

 public void calcLaserEnds()
 {
     ArrayList toIterate = new ArrayList();
     toIterate.AddRange(Game1.miscObjects);
     toIterate.AddRange(Game1.solidTiles);
     laserEnds[0] = 0;
     laserEnds[1] = 999999;
     laserEnds[2] = 0;
     laserEnds[3] = 999999;
     foreach (Object m in toIterate)
     {
         if ((m != this) && (m.getX() == x) && (m.blocksProjectiles()) && (m.getSolid() == true))
         {
             //calc laser end points
             if ((m.getY() > y) && (m.getY() < laserEnds[3]))
                 laserEnds[3] = m.getY() - 32;
             if ((m.getY() < y) && (m.getY() > laserEnds[2]))
                 laserEnds[2] = m.getY() + 32;
         }
         if ((m != this) && (m.getY() == y) && (m.blocksProjectiles()) && (m.getSolid() == true))
         {
             //calc laser end points
             if ((m.getX() > x) && (m.getX() < laserEnds[1]))
                 laserEnds[1] = m.getX() - 32;
             if ((m.getX() < x) && (m.getX() > laserEnds[0]))
                 laserEnds[0] = m.getX() + 32;
         }
     }
 }