<form id="form1" runat="server">     <div>         <div class="item">             Please input a number:             <asp:TextBox runat="server" CssClass="item" ID="txtTextCount"></asp:TextBox>                        <asp:Button runat="server" ID="btnCreate" Text="Create TextBox List" ValidationGroup="CreateTextBox"                 OnClick="btnCreate_Click" />               <asp:Button runat="server" ID="btnOK" Text="获取控件值" ValidationGroup="ShowListContent"                 OnClick="btnOK_Click" />         </div>         <div runat="server" id="divControls" class="item">         </div>         <div runat="server" id="divMessage">         </div>     </div> </form>

protected void Page_Load(object sender, EventArgs e)     {         if (this.IsPostBack)         {             int txtCount = int.Parse(txtTextCount.Text);             // 注意：每次PostBack时，都需要重新动态创建TextBox             CreateTextBoxList(txtCount);         }     }     ///<summary>      /// Create textbox list     ///</summary>     ///<param name="num">textbox list count</param>     private void CreateTextBoxList(int num)     {         HtmlGenericControl div;         HtmlGenericControl span;         TextBox txt;         //RegularExpressionValidator rev;         for (int i = 0; i < num; i++)         {             //创建div             div = new HtmlGenericControl();             div.TagName = "div";             div.ID = "divTextBox" + i.ToString();             div.Attributes["class"] = "item2";             //创建span             span = new HtmlGenericControl();             span.ID = "spanTextBox" + i.ToString();             span.InnerHtml = "Url Address" + (i + 1).ToString() + ":";             //创建TextBox             txt = new TextBox();             txt.ID = "txt" + i.ToString();             txt.CssClass = "input";             //创建格式验证控件，并且将其关联到对应的TextBox             //rev = new RegularExpressionValidator();             //rev.ID = "rev" + i.ToString();             //rev.ControlToValidate = txt.ID;             //rev.Display = ValidatorDisplay.Dynamic;             //rev.ValidationGroup = "ShowListContent";             //rev.ValidationExpression = @"(http(s)?://)?([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?";             //rev.ErrorMessage = "Invalid url Address!";             //添加控件到容器             div.Controls.Add(span);             div.Controls.Add(txt);             //div.Controls.Add(rev);             divControls.Controls.Add(div);         }     }     protected void btnCreate_Click(object sender, EventArgs e)     {         txtTextCount.Enabled = false;         btnCreate.Enabled = false;     }     protected void btnOK_Click(object sender, EventArgs e)     {         TextBox txt;         HtmlGenericControl span;         StringBuilder sbResult = new StringBuilder();         int txtCount = int.Parse(txtTextCount.Text);         //遍历获取动态创建的TextBox们中的Text值         for (int i = 0; i < txtCount; i++)         {             //注意：这里必须通过上层容器来获取动态创建的TextBox，才能获取取ViewState内容             txt = divControls.FindControl("txt" + i.ToString()) as TextBox;             if (txt != null && txt.Text.Trim().Length > 0)             {                 sbResult.AppendFormat("Url Address{0}: {1}.<br />", i + 1, txt.Text.Trim());             }         }         //遍历获取动态创建的TextBox们中的Text值         for (int i = 0; i < txtCount; i++)         {             //注意：这里必须通过上层容器来获取动态创建的TextBox，才能获取取ViewState内容             span = divControls.FindControl("spanTextBox" + i.ToString()) as  HtmlGenericControl ;             if (span != null && span.InnerText.Trim().Length > 0)             {                 sbResult.AppendFormat("Url Address{0}: {1}.<br />", i + 1, span.InnerText.Trim());             }         }         divMessage.InnerHtml = sbResult.ToString(); }