I have been battling a few days to pass variables from C# Windows Form Application to a PHP Web-Service. After numerous tests I concluded that the variables from the Windows For
You're just passing the literal hard-coded values "username" and "password", not the contents of the variables.
Try concatenating the variables into the URL instead:
WebRequest request = WebRequest.Create("https://mydomain.com.au/LoginVerification.php?username=" + username + "&password=" + password + "&Token=" + Token);