private void sendingTimer_Tick(object sender, EventArgs e)
        {
            AllegroRestAPIClass restAPI      = new AllegroRestAPIClass(clientIdTextBox.Text, clientSecretTextBox.Text, login);
            ManageOrdersClass   manageOrders = new ManageOrdersClass(login);

            manageOrders.ordersToDB(restAPI.getOrders());
            manageOrders.sendNewOrdersFromList();
        }
        private void downloadAuctionsButton_Click(object sender, EventArgs e)
        {
            //RestAPI request
            string clientID             = DB.singleDsToString(DB.selectFromDB("SELECT value FROM temporary_data_" + login + " WHERE name = 'client_id'"));
            string clientSecret         = DB.singleDsToString(DB.selectFromDB("SELECT value FROM temporary_data_" + login + " WHERE name = 'client_secret'"));
            AllegroRestAPIClass restAPI = new AllegroRestAPIClass(clientID, clientSecret, login);

            offersToListView(restAPI.getOffers());
        }
        //Authorization
        private void authorizeButton_Click(object sender, EventArgs e)
        {
            AllegroRestAPIClass restAPI = new AllegroRestAPIClass(clientIdTextBox.Text, clientSecretTextBox.Text, login);

            if (clientIdTextBox.Text == "")
            {
                if (clientSecretTextBox.Text == "")
                {
                    MessageBox.Show("Wypełnij wszystkie pola");
                    return;
                }
                MessageBox.Show("Wypełnij wszystkie pola");
                return;
            }
            else
            if (clientSecretTextBox.Text == "")
            {
                MessageBox.Show("Wypełnij wszystkie pola");
                return;
            }

            //Save details
            if (saveDetailsCheckBox.Checked == true)
            {
                DB.executeDB("UPDATE users SET client_id = '" + clientIdTextBox.Text + "', client_secret = '" + clientSecretTextBox.Text + "' WHERE login = '******'");
            }
            else
            {
                DB.executeDB("UPDATE users SET client_id = '', client_secret = '' WHERE login = '******'");
            }
            //Add temporary data to DB
            DB.executeDB("INSERT INTO temporary_data_" + login + " (name, value) VALUES ('client_id', '" + clientIdTextBox.Text + "')");
            DB.executeDB("INSERT INTO temporary_data_" + login + " (name, value) VALUES ('client_secret', '" + clientSecretTextBox.Text + "')");
            //Execute connection method
            restAPI.auth();
        }