C#

I am working on automatically find which webcam is working properly on my machine. Condition: 1) If you have two webcam one working and another one is not working. And the not working is in 0th position so is comes first so code taking 0th position.

2) If you installed a virtual webcam and integrated webcam already present so how to identify that which is a virtual or working webcam.

private void btnTest_Click(object sender, EventArgs e)
        {
            try
            {
                // Create a request for the URL. 
                WebRequest request = WebRequest.Create (
                  "https://time.website.com/pa/application.aspx#/TimesheetEntry");
                // If required by the server, set the credentials.
                request.Credentials = new System.Net.NetworkCredential("username", "password", "domain");
                //request.Credentials = CredentialCache.DefaultCredentials;
                // Get the response.
                WebResponse response = request.GetResponse ();
                // Display the status.
                lbxValues.Text += ((HttpWebResponse)response).StatusDescription;
                //Console.WriteLine(((HttpWebResponse)response).StatusDescription);
                // Get the stream containing content returned by the server.
                Stream dataStream = response.GetResponseStream ();
                // Open the stream using a StreamReader for easy access.
                StreamReader reader = new StreamReader (dataStream);
                // Read the content.
                string responseFromServer = reader.ReadToEnd ();
                // Display the content.
                lbxValues.Text += (responseFromServer);
                //Console.WriteLine (responseFromServer);
                // Clean up the streams and the response.
                reader.Close ();
                response.Close ();
            }   
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message + System.Environment.NewLine + ex.Source + System.Environment.NewLine + ex.TargetSite + System.Environment.NewLine + ex.StackTrace + System.Environment.NewLine + System.Environment.NewLine);
            }
        }