C#清空页面文本框

/// <summary>
    /// 清空文本框
    /// </summary>
    /// <param name="controls"></param>
    public void EmptyTextBox(ControlCollection controls)
    {
        foreach (Control c in controls)
        {
            if (c.Controls.Count > 0)
            {
                // 递归
                this.EmptyTextBox(c.Controls);
            }
            else if (c is TextBox)
            {
                // 服务器控件
                ((TextBox)c).Text = "";
            }
            else if (c is HtmlInputText)
            {
                // HTML 控件
                ((HtmlInputText)c).Value = "";
            }
        }
    }