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   //静态变量存储控件列表
        static List txtlist = new List();
        //控件id
        static int id = 1;
        protected void Button1_Click(object sender, EventArgs e)
        {
            var txt = new TextBox
            {
                ID = id.ToString(),
                Text = "Sample textbox " + id.ToString()
            };
            this.Panel1.Controls.Add(txt);
            txtlist.Add(txt);
            //id自增1
            id++;
        }
        /// 

        /// 还原控件
        /// 
        void RestoreTextBox()
        {
            foreach (var item in txtlist)
            {
                if (item != null)
                {
                    this.Panel1.Controls.Add(item);
                }
            }
        }
        ///