Selenium WebDriver C# : Login Page

LoginPage.cs

using OpenQA.Selenium;
using OpenQA.Selenium.Support.PageObjects;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ISMDemoApplication
{
    class LoginPage
    {


        //public LoginPage(IWebDriver driver)=> PageFactory.InitElements(driver, this);

        public LoginPage(IWebDriver driver)
        {
            PageFactory.InitElements(driver, this);
        }


        [FindsBy(How = How.CssSelector, Using = "#UserName")]
        public IWebElement txtUsername { get; set; }

        [FindsBy(How = How.CssSelector, Using = "#Password")]
        public IWebElement txtPassword { get; set; }


        [FindsBy(How = How.CssSelector, Using = ".btn-login > .btn-cnt")]
        public IWebElement btnLogin { get; set; }


        [FindsBy(How = How.CssSelector, Using = ".validation-summary-errors span")]
        public IWebElement errValidation { get; set; }



        public LoginPage typeUsernme(string username)
        {
            txtUsername.SendKeys(username);
            return this;
        }


        public LoginPage typePassword(string password)
        {
            txtPassword.SendKeys(password);
            return this;
        }


        public LoginPage clickLoginFailure()
        {
            btnLogin.Click();
            return this;
        }

        public string getValidationError()
        {
            return errValidation.Text;
        }




    }
}

This is used for Pragmatic Training