c#: 向后台发送消息

向后台发送消息
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//htm,aspx

xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
xmlHttpReq.open('POST',xmlurl,false);
xmlHttpReq.send(sxml);

if (xmlHttpReq.status != 200)
{
var sText = xmlHttpReq.statusText;
alert(sText);
}
else
{
var sText = xmlHttpReq.responseText;
}

//aspx.cs

byte[] byts = new byte[Request.InputStream.Length];
Request.InputStream.Read(byts,0,byts.Length);

string req = System.Text.Encoding.Default.GetString(byts);
req=Server.UrlDecode(req);

trace(req);

...
...
...

output="<root><req text='" + output+ "' errcode='" + errcode + "'>" +purview + "</req></root>";
Response.Write(output);
Response.End();