1、在客户端可以将form用submit提交，如下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="JS/jquery-1.3.2.js" type="text/javascript"></script>
<script language="javascript" type="text/javascript">
function UpLoad() {
$("#form1").submit();
}
</script>
</head>
<body>
<form id="form1" method="post" enctype="multipart/form-data" action="ImageHandler.ashx">
<div>
<input id="File1" type="file" runat="server"/>
<input id="Button1" type="button" value="上传" onclick="UpLoad()" /></div>
<div id="imgList"></div>
</form>
</body>
</html>
2、form表单需要加上属性method="post" enctype="multipart/form-data"
3、文件控件需要加上runat="server"属性
