flex navigateToURL传送的值 C#取不到
flex里这样写

private const _strDownScript:String="http://localhost:3269/Web/DownFile.aspx";
          var LoadVars:URLVariables = new URLVariables();
 LoadVars.filename = //文件名称
 LoadVars.path=//文件路径
 var request1:URLRequest = new URLRequest();
 request1.data = LoadVars;
 request1.url = _strDownScript
 request1.method = URLRequestMethod.POST;
 navigateToURL(request1,"_blank");

然后我在C#里用
string fName = Convert.ToString(Request.Form["filename"]);
string fPath = Convert.ToString(Request.Form["path"]);
取不到值。
应该怎么取呢 请大虾指点 多谢
[解决办法]
不是Request.query..那个什么嘛