c# picturebox_imagelist_image_clear_removeat

//載入影像
        private void button2_Click(object sender, EventArgs e)
        {
            if (imageList1.Images.Count==0)
            {
                MessageBox.Show("IMAGELIST沒有影像，顯示個屁喲");
            }
            pictureBox1.Image = imageList1.Images[0];
        }

   
        //移除影像
        private void button3_Click(object sender, EventArgs e)
        {
            //下述程式碼報index無效錯誤了 下述程式碼不能重複點選移除影像

           //按鈕，因為索引會發生變化
            imageList1.Images.RemoveAt(0);
           

            //images.clear移除imagelist所有影像
            //imageList1.Images.Clear();
        }