WebClient error

[yyy]

This problem bothers me for a long time:
I use WebClient.DownloadData in order to read text from an HTML
document this way:

WebClient c = new WebClient();
string html=
ASCIIEncoding.Default.GetString(c.DownloadData("http://www.test.com"));

When I run the code, I get this error message after a few seconds:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.Net.WebException: The underlying connection was closed:

Unable to connect to the remote server.

at System.Net.HttpWebRequest.CheckFinalStatus()
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.HttpWebRequest.GetResponse()
at System.Net.WebClient.DownloadData(String address)
at RE.MainForm.Button1Click(Object sender, EventArgs e) in

c:\Documents and Settings\Y\My Documents\SharpDevelop
Projects\RE\MainForm.cs:line 93

at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m,

MouseButtons button, Int32 clicks)

at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at

System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)

at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32

msg, IntPtr wparam, IntPtr lparam)

What can I do to solve it? It worked once and stopped working a few
months ago.

 

[Guest]

I met the same error when the web site return 500 error.
Try to access the HTML document with ie, hope this be helpful.