有没有办法通过登录信息来阅读C语言的网站#

        WebRequest myWebRequest = WebRequest.Create("http://www.myurl.com/test.aspx");
        WebResponse myWebResponse = myWebRequest.GetResponse();
        Stream ReceiveStream = myWebResponse.GetResponseStream();
        Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
        StreamReader readStream = new StreamReader(ReceiveStream, encode);
        string strResponse = readStream.ReadToEnd();

问题是他们现在在页面上有身份验证,所以当我进入网站时会得到登录提示,必须输入用户名和登录名。

我的代码现在返回错误:

The remote server returned an error: (401) Unauthorized.

我试着加上:

myWebRequest.Credentials = new NetworkCredential("[username]", "[pwd]");

而这个:

ServicePointManager.ServerCertificateValidationCallback += delegate { return true; }; 

但还是有同样的错误:

在上面的WebRequest代码中是否有传递这些凭据的方法?