Accessing dynamically created checkbox in c#
===

I am creating a few checkboxes when I open a form with the following code:

        private void OpenFolder_Load(object sender, EventArgs e)
        {
            int i = 0;
            foreach (string file in filesToOpen)
            {
                Label lbl = new Label();
                lbl.Text = Path.GetFileNameWithoutExtension(file);
                lbl.Width = 200;
                lbl.Height = 25;
                lbl.AutoEllipsis = true;
                lbl.Location = new System.Drawing.Point(10, 40 + 25 * i);
                
                this.Controls.Add(lbl);

                string checkName = "check" + i;
                CheckBox check = new CheckBox();
                check.Checked = true;
                check.AccessibleName = checkName;
                check.Location = new System.Drawing.Point(340, 40 + 25 * i);
                check.CheckedChanged +=new EventHandler(check_CheckedChanged);

                this.Controls.Add(check);
                
                CheckBoxes.Add(check);

                i++;
            }
and I am trying to check the state of the checkboxes everytime one changes to toggle my OK button (the user can validate only if there are a certain number of the checkboxes checked)

here is the code I use, but it fails as I am not able to target the checkboxes:

        private void check_CheckedChanged(Object sender, EventArgs e)
        {
            for (int i = 0; i < filesToOpen.Count(); i++)
            {
                string tbarName = "tbar" + i;
                string checkName = "check" + i;

                CheckBox ckb = this.Controls.OfType<CheckBox>().Where(c => c.AccessibleName.Equals(checkName)) as CheckBox;
                TrackBar tkb = this.Controls.OfType<TrackBar>().Where(t => t.AccessibleName.Equals(tbarName)) as TrackBar;
                //TrackBar tkb = this.Controls.Find(tbarName, false).First() as TrackBar;
                //CheckBox ckb = this.Controls.Find(checkName, false).First() as CheckBox;

                if (ckb.Checked == true)
                {
                    //do stuff
                }
            }
        }

what am I doing wrong/really wrong?