Saving Multiple CheckBoxes in Single Column Database

private void button1_Click(object sender, EventArgs e)
{
    string s = "";
    foreach(Control c in this.Controls)
    {
        if (c is CheckBox)
        {
            CheckBox b = (CheckBox) c;
            if (b.Checked) {
                //s = b.Text + s; // if u want to add spaces or seperation between ur selection u can add like this
                s = b.Text + "," + s;
            }
        }
    }
    MessageBox.Show(s); //if u want to save in database u can directly save string value s

    cn.Open();
    SqlCommand cmd = new SqlCommand("insert into mcombo values('" + s + "')", cn);
    cmd.ExecuteNonQuery();
    cn.Close();
}

//videoor go through this youtube
videohttps: //www.youtube.com/watch?v=hJ5m-PH6td4