how to use switch statement to navigate between url c#

Question

i have this method which will take 1 url :

public static void LaunchSite(Uri sitUrl)
       {

           SHDocVw.ShellWindows w = new SHDocVw.ShellWindows();
           bool found = false;
           foreach (SHDocVw.ShellBrowserWindow item in w)
           {
               var doc = item.LocationURL;
               if (!string.IsNullOrEmpty(doc))
                   if (doc == sitUrl.AbsoluteUri)
                   {
                       found = true;
                       break;
                   }
           }
           if (!found)
               Process.Start(sitUrl.AbsoluteUri);
       }

button event handler looks like this

 

 

private void btnSubs_Click(object sender, RoutedEventArgs e)
      {
          //StartProcess.webSit();
          Uri oxfArt = new Uri(@"http://www.oxfordartonline.com/subscriber/");
          Uri theoryTst = new Uri("http://theorytestpro.co.uk/");
          string webAddress = oxfArt.OriginalString;
          switch (webAddress)
          {
              case "http://www.oxfordartonline.com/subscriber/":
               StartProcess.LaunchSite(oxfArt);
                  break;
              case "http://theorytestpro.co.uk/":
                  StartProcess.LaunchSite(theoryTst);
                  break;
              default:
                  break;
          }


      }

 the button event handler will handle multiple buttons so depending on which button clicked need to determine which Uri need to be launched using switch statement. thank you