Selenium Webdriver : I am not able to switch to iframe - selenium

Question

Here is the code that I have written.I have tried adding thread.sleep() but it still doesn't work also tried with chromedriver but same result
package com.thinksys.frames;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
public class Iframes
{
public static void main(String[] args)
{
System.setProperty("webdriver.gecko.driver","C:\\Users\\thinksysuser\\Downloads\\geckodriver-v0.18.0-win64\\geckodriver.exe");
WebDriver driver = new FirefoxDriver();
driver.get("https://www.irctc.co.in/eticketing/loginHome.jsf");
WebElement e = driver.findElement(By.id("google_ads_iframe_/37179215/DFP_NGET_01_HomePage_RHS_ATF_479x266_ENG_0"));
driver.switchTo().frame(e);
driver.findElement(By.xpath(".//*[#id='image-11']/a/img")).click();
}
}

Answer 1

It might caused by the special characters in the <ifram> id. Using partial id will provide two matches, so I suggest you use two portions of the name attribute
WebElement frame = driver.findElement(By.cssSelector("[name*='google_ads_iframe'][name*='DFP_NGET_01_HomePage_RHS']"));
driver.switchTo().frame(frame);
Edit
The images rotates, each on is visible for a few seconds only. To click on a specific image you need to wait for it to be visible. You can use explicit wait for it
WebDriverWait wait = new WebDriverWait(driver, 60, 50);
wait.until(ExpectedConditions.visibilityOfElementLocatedBy.xpath(".//*[#id='image-11']/a/img"))).click();
This will pole the DOM every 100 milliseconds until the image is visible or the time is up (60 seconds).

Answer 2

There is variations on browsers to display ads. I have opened in Firefox and not able to see the ad while its displaying in chrome. and the scenario while i do open the Chrome or Firefox browser using script there is no ad section.
based on this scenario you can check that weather frame is available or not if available then switch into it and wait till the image you gonna click get visible then click on it
You can try this way :
WebDriverWait wait = new WebDriverWait(driver, 120);
wait.until(ExpectedConditions.frameToBeAvailableAndSwitchToIt(driver.findElement(By.xpath("//iframe[starts-with(#id,'google_ads_iframe')][#title='3rd party ad content']"))));
wait.until(ExpectedConditions.visibilityOf(driver.findElement(By.xpath("//div[#id='image-11']/a/img")))).click();
or
WebDriverWait wait = new WebDriverWait(driver, 120);
List <WebElement> adFrame = driver.findElements(By.xpath("//iframe[starts-with(#id,'google_ads_iframe')][#title='3rd party ad content']"))
if(adFrame.size()>0)
{
driver.switchTo().frame(adFrame.get(0));
wait.until(ExpectedConditions.visibilityOf(driver.findElement(By.xpath("//div[#id='image-11']/a/img")))).click();
}
else
{
System.out.println("Sorry there is no ads");
}