利用XMLHTTP下载文件
和以前的方法一样，先添加引用－COM－Microsoft Xml 3.0，然后在代码开始处写：
<![CDATA[using MSXML2;<br />
]]>
下面就是主要的代码：
<![CDATA[private void Page_Load(object sender, System.EventArgs e)<br />
{<br />
string Url = "http://dotnet.aspx.cc/Images/logoSite.gif";<br />
string StringFileName = Url.Substring(Url.LastIndexOf("/") + 1);<br />
string StringFilePath = Request.PhysicalApplicationPath;<br />
if(!StringFilePath.EndsWith("/")) StringFilePath += "/";<br />
MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();<br />
_xmlhttp.open("GET",Url,false,null,null);<br />
_xmlhttp.send("");<br />
if( _xmlhttp.readyState == 4 )<br />
{<br />
if(System.IO.File.Exists(StringFilePath + StringFileName))<br />
System.IO.File.Delete(StringFilePath + StringFileName);<br />
System.IO.FileStream fs = new System.IO.FileStream(StringFilePath + StringFileName, System.IO.FileMode.CreateNew);<br />
System.IO.BinaryWriter w = new System.IO.BinaryWriter(fs);<br />
w.Write((byte[])_xmlhttp.responseBody);<br />
w.Close();<br />
fs.Close();<br />
Response.Write ("文件已经得到。<br /><a href="%22%20+%20Request.ApplicationPath%20+%20StringFileName%20+%22" target="_blank">");<br />
Response.Write ("查看" + StringFileName + "</a>");<br />
}<br />
else<br />
Response.Write (_xmlhttp.statusText);<br />
Response.End();<br />
}<br />
]]>