.NET (Core and Framework)

Private Sub cmdUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdUpdate.Click
       Dim strconnection As String = "Data Source=ELIANE-VAIO\SQLEXPRESS;Initial Catalog=DatabaseConnection;Integrated Security=True;"
       Dim _cn As SqlConnection = New SqlConnection(strconnection)
       Dim cmd As New SqlCommand
       _cn.Open()
       Dim strsql As String
       strsql = "update tblcustomer set "
       strsql = strsql & " ID = '" & txtCurrent.Text & "', "
       strsql = strsql & " name = '" & txtName.Text & "', "
       strsql = strsql & " email = '" & txtEmail.Text & "', "
       strsql = strsql & " address = '" & txtAddress.Text & "', "
       strsql = strsql & " deptid = " & cbDept.SelectedValue
       strsql = strsql & " where serial = " & Val(txtserial.Text)
       cmd.CommandText = strsql
       cmd.Connection = _cn
       cmd.ExecuteNonQuery()
       cmdRequery.PerformClick()
   End Sub

public ActionResult EmailSettings(string jsonData, string tokenAuthenticate, string clientID, string APIkey, string ClientSecret)
        {
            HttpContext.Application["EmailAdmin"] = jsonData;
            HttpContext.Application["EmailAccessOken"] = tokenAuthenticate;
            this.clientID = clientID;
            this.APIkey = APIkey;
            this.ClientSecret = ClientSecret;
            //oneTry();
            CreateService(tokenAuthenticate); //Error at this line
            //UseSavedAuthorization();
            return View();
        }
private CalendarService CreateService(string token)
    {
        //KeyValuePair<string, string> credentials = Ninject.Web.Common.Get3LOCredentials();
        var provider = new NativeApplicationClient(GoogleAuthenticationServer.Description, this.clientID, this.ClientSecret);
        //provider.ClientIdentifier = clientID;
        //provider.ClientSecret = clientSecret;
        var auth = new Google.Apis.Authentication.OAuth2.OAuth2Authenticator<NativeApplicationClient>(provider, (p) => GetAuthorization(provider, token));
        CalendarService service = new CalendarService(new BaseClientService.Initializer()
        {
            Authenticator = auth,
            ApiKey = ConfigurationManager.AppSettings[this.APIkey].ToString(),
            GZipEnabled = false
        });
        return service;
    }

    private static IAuthorizationState GetAuthorization(NativeApplicationClient arg, String Refreshtoken)
    {
        IAuthorizationState state = new AuthorizationState(new[] { CalendarService.Scopes.Calendar.GetStringValue() });
        state.Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl);
        state.RefreshToken = Refreshtoken;
        return state;
    }