Counting number of current checked boxes and output that number in c#

I am trying to count the number of the current checked "checked box" in a group box. I have like 10 check boxes.

I been trying some code but I only managed to count upward if I checked the box but not the other way around. So it is only adding up (but not +1 each time).

So what approach do I have to take to count the number of the current (not incrementing) checked boxes? Thank you

int checkedBoxes = 0;


        private void checkBox1_Click(object sender, EventArgs e) {

            CheckBox check = (CheckBox)sender;
            bool result = check.Checked;

            if (result == true) {
                btnDone.Enabled = true;
            }



            foreach(Control c in grpToppings.Controls) {
                    CheckBox cb = c as CheckBox;
                    if (cb != null && cb.Checked){
                    checkedBoxes += 1;
                    int how_many = checkedBoxes;
                    }
                }
           }


    private void btnDone_Click(object sender, EventArgs e) {

         string name = textbox_orderName.Text;
         MessageBox.Show( "\nhow many: " + checkedBoxes, "It is done",
         MessageBoxButtons.OK);
        }