WebMainPage

public class WebMainPage
{
    IWebDriver driver;
    public WebMainPage(IWebDriver driver)
    {
        this.driver = driver;
        PageFactory.InitElements(driver, this);
    }
    [FindsBy(How = How.Id, Using = "username")]
    private IWebElement lUsername;

    public string GetUsername()
    {
        return lUsername.Text;
    }
}