遍历窗体上所有CheckBox控件 .net winform

//遍历窗体上所有CheckBox控件 .net winform

StringBuilder sb = new StringBuilder();
foreach (Control c in Controls)
{
    if (c is CheckBox)
    {
        if (((CheckBox)c).Checked == true)
        {
            sb.Append(",");
            sb.Append(c.Text.ToString());
        }
    }
}
sb.Append(",");

textBox1.Text = sb.ToString();