WebClient client = new WebClient();
client.DownloadFile(path, @"...");

//saveImage = ImageIO.read();
//ImageIO.write(saveImage "...", new File("..."));

using System;
using System.Drawing.Imaging;
using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using OpenQA.Selenium.Support.UI;
using OpenQA.Selenium.Interactions;
using OpenQA.Selenium.Internal;
using System.Net;
using System.IO;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace Selenium.Sample
{
[TestClass]
public class UnitTest1
{
    ChromeDriver chrome;

    [TestMethod]
    public void TestMethod1()
    {
        chrome = new ChromeDriver();
        chrome.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(10);
        chrome.Navigate().GoToUrl("http://www.google.com/");
        chrome.FindElement(By.Id("lst-ib")).SendKeys("фото дня" + Keys.Enter);
        chrome.FindElement(By.CssSelector("div.hdtb-mitem:nth-child(2) > a:nth-child(1)")).Click();
        chrome.FindElement(By.CssSelector("#abar_button_opt")).Click();
        chrome.FindElement(By.CssSelector("#lb > div > a:nth-child(3)")).Click();
        chrome.FindElement(By.CssSelector("#imgsz_button")).Click();
        chrome.FindElement(By.XPath("//*[@id=':7d']")).Click();
        chrome.FindElement(By.CssSelector("body > div.bottom-wrapper > div._Vkb > form > div:nth-child(8) > div:nth-child(10) > div._Ai > input")).Click();
        //chrome.FindElement(By.CssSelector("#rg_s > div:nth-child(1) > a > img")).Click();
    }
    public void search(string query = null);
    {
        const string url = "https://ww.google.com/search?tbm=isch&q=";
    var chrome = new ChromeDriver();
    chrome.Navigate(url + query);
        while (chrome.ReadyState != WebBrowserReadyState.Complete);
        {
            ApplicationId.DoEvents();
        }

private void Download(string url = null)
    {
        using (WebClient client = new WebClient())
        {
            client.DownloadFile(url, Path.GetFileName(url));
        }
    }