Question

This is my code:

string Url = "http://illution.dk/";
WebClient Http = new WebClient();
Http.DownloadStringAsync(new Uri(Url));
Http.DownloadStringCompleted += new DownloadStringCompletedEventHandler(GetModelTypeResponse);

If I run this on a machine with no internet connection an error will be thrown. “Hostname could not be resolved”

Is there any way I can remove this error message? Or check if there isn’t an internet connection?

Edit 1

try
{
ComputerInfo ComputerInfoComp = new ComputerInfo();
string Url = "http://illution.dk/"
WebClient Http = new WebClient();
Http.DownloadStringAsync(new Uri(Url));
Http.DownloadStringCompleted += new         DownloadStringCompletedEventHandler(GetModelTypeResponse);
ComputerInfoComp = null;
}
catch (System.Net.WebException e)
{
//
}

Answer 1

Check e.Error in your GetModelTypeResponse handler method. If e.Error is of type WebException then check webException.Status value. The value will be WebExceptionStatus.NameResolutionFailure in case of “Hostname could not be resolved” exception

public void GetModelTypeResponse(object sender, DownloadStringCompletedEventArgs e)
{
    var webException = e.Error as WebException;
    if (webException != null && 
        webException.Status == WebExceptionStatus.NameResolutionFailure)
    {
        // log
        return; // ignore
    }

    // proceed
    ..
}