public void BtnSubmit_OnClick(object sender, RoutedEventArgs e)
    {


        if (TxtUsername.Text.Length<3 || TxtPassword.Text.Length<3)
        {
            MessageBox.Show("You need to fill both boxes!");
        }

        else if (!TxtUsername.Text.Contains("@"))
        {
            MessageBox.Show("You need to add valiable e-mail adress");
        }

        else
        {

            LblLogin.Content = "Logging in..."; // changes label content

            sendUsername();  // opens chromedriver and logs us into the website

            ((MainWindow)Application.Current.MainWindow).tradeUrl = tradeUrl;

            ((MainWindow) Application.Current.MainWindow).username = username;

            ((MainWindow) Application.Current.MainWindow).login = TxtUsername.Text;

            ((MainWindow)Application.Current.MainWindow).password = TxtPassword.Text;
        }
    }