The first loop for printing driver.WindowHandles giving me 2 window handles when only one window is opened

for getting the number of window handles after opening one window and after opening one more window.the first for loop is giving me 2 window handles instead of 1,when only 1 window is opened.whereas the second loop is giving me 2 window handles which is after opening the second window which is correct.

public class BaseTest    {        public IWebDriver driver;        [OneTimeSetUp]        public void Setup()        {            driver = new ChromeDriver();            driver.Manage().Window.Maximize();        } 

       [OneTimeTearDown]         public void TearDown()         {             driver.Quit();            extent.Flush();        }

     }

[TestClass]    public class Tests :BaseTest    {        BaseTest base1=new BaseTest();

 [Test]        public void Test6()        {            HTMLtestPage hTMLtestPage= new HTMLtestPage(driver);            //hTMLtestPage.searchSome();            hTMLtestPage.htmlres();        }

      }

public class HTMLtestPage    {   public void htmlres()        {       driver.Url = "https://www.google.com/";    Console.WriteLine("initial no of windhandls");    List<String> list = new List<String>(driver.WindowHandles);    foreach (var x in list)    {    Console.WriteLine(x);    }    Thread.Sleep(1000);    driver.SwitchTo().NewWindow(WindowType.Window);    driver.Url = "https://www.w3schools.com/Xml/xpath_syntax.asp";    Console.WriteLine(driver.CurrentWindowHandle);    Thread.Sleep(1000);    List<String> listn = new List<String>(driver.WindowHandles);    Console.WriteLine("printing in for loop");    foreach (var y in listn){    Console.WriteLine(y);    }}

}

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