遍历页面中的控件

 StringBuilder str = new StringBuilder();
        foreach (Control ctr in this.Page.Controls[3].Controls)
        {
            if (ctr.GetType().Name == "CheckBox")
            {
                CheckBox cb = (CheckBox)ctr;
                if (cb.Checked)
                    str.Append(cb.Text + "<br/>");
            }
        }
        Literal1.Text = str.ToString();