protected void Button2_Click(object sender, EventArgs e)
    {
        int iLevel;
        iLevel = 0;
        litProgramCaption.Text = myGetControlList(Form.Controls, ref iLevel);
    }

    private string myGetControlList(ControlCollection ccl, ref int iLevel)
    {
        StringBuilder sLines = new StringBuilder();
        iLevel++;
        sLines.Length = 0;
        foreach (Control ct in ccl)
        {
            sLines.Append(iLevel);
            sLines.Append('-', iLevel);
            sLines.Append(ct.ID);
            sLines.Append("=");
            sLines.Append(ct.GetType());
            sLines.Append("<br>");
            if (ct.HasControls())
                sLines.Append(myGetControlList(ct.Controls, ref iLevel));
        }
        return sLines.ToString();
    }