我如何只能运行一个Selenium实例？

Question

我想从另一个类访问Form1类Selenium，但是 这里的问题是每当执行Form1硒访问另一个实例时执行。 我只想只使用一个实例。 有人启发我，万分感谢

Public Class Form1
    Public service As ChromeDriverService = ChromeDriverService.CreateDefaultService
    Public chromeOptions As New OpenQA.Selenium.Chrome.ChromeOptions()
    Public  driver As New OpenQA.Selenium.Chrome.ChromeDriver(chromeOptions)

    Private Sub Button1_Click_1(sender As Object, e As EventArgs) Handles btnCollect.Click
        ' i only want to run one webdriver session not multiple session.
        Monitoring.test()
        Monitoring2.test2()

    End Sub
end class

Public Class Monitoring
    public sub test()
         driver.Navigate().GoToUrl("https://www.google.com")
    end sub

end class

Public Class Monitoring2
    public sub test2()
         driver.Navigate().GoToUrl("https://www.yahoo.com")
    end sub

end class