label runat="server"

  <label id="lblWhiteIp_Text_Info" runat="server"></label>

后台对应的类型是

protected global::System.Web.UI.HtmlControls.HtmlGenericControl lblWhiteIp_Text_Info;

<asp:label id="lblWhiteIp_Text_Info" runat="server"></asp:label>

后台对应的类型是

protected global::System.Web.UI.WebControls.Label lblWhiteIp_Text_Info;