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在了解HTTP断点续传的原理之前，先来说说HTTP协议，HTTP协议是一种基于tcp的简单协议，分为请求和回复两种。请求协议是由客户机(浏览器)向服务器（WEB SERVER）提交请求时发送报文的协议。回复协议是由服务器(web server)，向客户机(浏览器)回复报文时的协议。请求和回复协议都由头和体组成。头和体之间以一行空行为分隔。
......
<asp:TemplateField HeaderText="测试">
<ItemTemplate>
<asp:LinkButton ID="test" runat="server" OnClick="test_Click" OnClientClick='<%# string.Format("return confirmDelete(\"{0} {1}\");", DoEscape((string)Eval( ......
1 使用标准HTML来进行图片上传
前台代码：
<body>
<form id="form1" runat="server">
<div>
<table>
&nbs ......
