Checkbox count DataGridView

Yoo man!
you can do this:

in your checkbox inside the datagridview, you must set the event to increment your label count if is true
or decrement if it's false;

checkbox1.CheckedChanged = checkBox1.CheckedChanged += new EventHandler(checkBox1_CheckedChanged);

protected void checkBox1_CheckedChanged(object sender, EventArgs e)
{
  //If the checkbox is true increment else decrement.
   LabelCount.Text = ((CheckBox)sender).Checked ? (Convert.ToInt32(LabelCount.Text) + 1).ToString() :
                                                             (Convert.ToInt32(LabelCount.Text) - 1).ToString() :
}

Regards
Rodrigo Leote

How do I access the checkbox inside of the datagridview??

I access the checkboxes value by using
datagridview1[0,ROW].value

What event lets me know that the checkbox value has changed so that I may recalculate?

sorry, i forgot to add this.

//This will find the control inside tthe datagridview
CheckBox chkBox =  (CheckBox)dataGridView1.Controls["checkbox1"];

//This will set the event in the CheckBox
chkBox.CheckedChanged = checkBox1.CheckedChanged += new EventHandler(checkBox1_CheckedChanged);

Ok im still a little lost.  Where in the program do I define chkBox?  

Does (CheckBox)dataGridView1.Controls["checkbox1"] give me access when the checkbox is clicked on any row?