public IActionResult Login()
        {
            var redirectUrl = Url.Action("Callback", "GoogleOAuth");
            var properties = new AuthenticationProperties
            {
                RedirectUri = redirectUrl
            };
            return Challenge(properties, GoogleDefaults.AuthenticationScheme);
        }

 public IActionResult Login()
        {
            var redirectUrl = Url.Action("Callback", "GoogleOAuth");
            var properties = new AuthenticationProperties
            {
                RedirectUri = redirectUrl
            };
            return Challenge(properties, GoogleDefaults.AuthenticationScheme);
        }