aspx页面：
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="上传和下载文件.aspx.cs" Inherits="上传和下载文件" %>
<!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>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<asp:FileUpload ID="homeworkFile" runat="server" />
<asp:Button ID="btnAdd" runat="server" Text="上传" OnClick="btnAdd_Click"/></br>
<asp:Button ID="btndownfile" runat="server" Text="下载方法一：TransmitFile"
onclick="btndownfile_Click" /></br>
<asp:Button ID="btndownfilebyWriteFile" runat="server"
Text="下载方法二：WriteFile" onclick="btndownfilebyWriteFile_Click" /></br>
<asp:Button ID="btndownfilebyWriteFile2" runat="server"
Text="下载方法三：WriteFile分块" onclick="btndownfilebyWriteFile2_Click" /><br />
<asp:Button ID="btndownfilebystream" runat="server" Text="下载方法四：流方式下载"
onclick="btndownfilebystream_Click" />
</form>
</body>
</html>
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