System.Net.WebException”类型的异常

[mation]

我编写了如下代码：
HttpWebRequest Http_Request= (HttpWebRequest)WebRequest.Create(FileUrl);
Http_Request.AddRange(B_Pos,E_Pos);
HttpWebResponse Http_Response = (HttpWebResponse)Http_Request.GetResponse();
Stream Http_Stream = Http_Response.GetResponseStream();但是总是出现如下错误，“未处理的“System.Net.WebException”类型的异常出现在 system.dll 中。
其他信息: 远程服务器返回错误: (401) 未经授权。”请给为高手指点

[hfwang009]

Uri theURL = new Uri(@"HTTP://172.18.33.199/PDAWEB/WEBFORM1.aspx?sType=QryUser&sParams=" + sParams);
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(theURL);
httpRequest.Method = "GET";
HttpWebResponse httpResponse;
httpResponse = (HttpWebResponse)httpRequest.GetResponse();

這是我的實例,可以用的,不知道跟你有甚麼差異你可以去試一下