Container.GetFreeSlot C# (CSharp) Method

    public static int GetFreeSlot(Container cn)
    {
        //Returns an available slot on the current container.
        for (int i=0;i<=cn.MaxCapacity();i++)
        {
            if (cn.GetItemAt (i)=="")
            {
                return i;
            }
        }
        return -1;
    }