1. <%--exegesics--%> 注释

相当于<!---->

2. <% code%> 绑定后台代码块：

//相当于写在后台的可执行代码
<form id="form1" runat="server">  
        <%--绑定后台代码块--%>  
        <% for (int i = 1; i <= 10; i++)  
           { %>  
        <%=i %>  
        <%} %>  
</form>

3.<%= variable %> 绑定 后台变量：

//还可以绑定后台方法<%=NewMethod()%> 也可以写作<%:variable %>
<form id="form1" runat="server">  
        <%=_title %>  
</form>

Code behind

namespace WebApplication  
{  
    public partial class Index : System.Web.UI.Page  
    {  
        public string _title = "";  
        protected void Page_Load(object sender, EventArgs e)  
        {  
            if (!IsPostBack)  
            {  
                _title = "标题";  
            }  
        }  
    }  
}

4.<%# Eval("field")%>绑定DataSource的值

<form id="form1" runat="server">  
       <asp:Repeater ID="Repeater" runat="server">  
           <ItemTemplate>  
               <span><%# Eval("name") %></span>  
           </ItemTemplate>  
       </asp:Repeater>  
</form>

code behind

this.Repeater.DataSource = null;

5.<%$ %> 绑定web.config的值

<form id="form1" runat="server">  
        <asp:Literal ID="Literal1" runat="server" Text="<%$appSettings:upload_image_path%>" />  
</form>

web.config

<configuration>  
  <appSettings>  
    <add key="upload_image_path" value="/upload/images/"/>  
  </appSettings>  
  <system.web>  
    <compilation debug="true" targetFramework="4.0" />  
  </system.web>  
</configuration>

6.  <%@ %>主要用于在web页面定义Page、引入控件、组件、设置Cache等：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Index.aspx.cs" Inherits="benben.Index" %>