Top 20 Selenium with C# interview questions with answer

Mayank Gupta
5 min readJul 9, 2023

Question: How do you launch a browser using Selenium WebDriver in C#?

Answer: You can launch a browser using Selenium WebDriver in C# using the following code:

using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;

// Create an instance of the ChromeDriver
IWebDriver driver = new ChromeDriver();

// Open a URL in the browser
driver.Navigate().GoToUrl("https://www.example.com");

Question: How do you locate elements using Selenium WebDriver in C#?

Answer: You can locate elements using Selenium WebDriver in C# using various methods such as:

  • FindElement(By.Id("id")) - Locates an element by its ID attribute.
  • FindElement(By.Name("name")) - Locates an element by its Name attribute.
  • FindElement(By.XPath("xpath")) - Locates an element using XPath expression.
  • FindElement(By.CssSelector("cssSelector")) - Locates an element using CSS selector.

Question: How do you perform actions on elements using Selenium WebDriver in C#?

Answer: You can perform actions on elements using Selenium WebDriver in C# using methods such as:

  • Click() - Clicks on an element.
  • SendKeys("text") - Enters text into an input field.
  • Clear() - Clears the content of an input field.
  • GetAttribute("attribute") - Retrieves the value of a specified attribute of an element.

Question: How do you handle dropdowns in Selenium WebDriver with C#?

Answer: To handle dropdowns in Selenium WebDriver with C#, you can use the SelectElement class from the OpenQA.Selenium.Support.UI namespace. Here's an example:

using OpenQA.Selenium.Support.UI;

// Select the dropdown element
IWebElement dropdown = driver.FindElement(By.Id("dropdown"));

// Create a SelectElement instance
SelectElement select = new SelectElement(dropdown);

// Select an option by visible text
select.SelectByText("Option 1");

// Select an option by value
select.SelectByValue("value1");

// Select an option by index
select.SelectByIndex(0);

Question: How do you handle alerts in Selenium WebDriver with C#?

Answer: To handle alerts in Selenium WebDriver with C#, you can use the SwitchTo() method to switch the focus to the alert. Here's an example:

using OpenQA.Selenium;

// Switch to the alert
IAlert alert = driver.SwitchTo().Alert;

// Accept the alert
alert.Accept();

// Dismiss the alert
alert.Dismiss();

// Get the text of the alert
string alertText = alert.Text;

Question: How do you handle frames and iframes in Selenium WebDriver with C#?

Answer: To handle frames and iframes in Selenium WebDriver with C#, you can use the SwitchTo() method to switch the focus to the desired frame. Here's an example:

using OpenQA.Selenium;

// Switch to a frame by index
driver.SwitchTo().Frame(0);

// Switch to a frame by name or ID
driver.SwitchTo().Frame("frameName");

// Switch back to the default content
driver.SwitchTo().DefaultContent();

Question: How do you handle multiple windows or tabs in Selenium WebDriver with C#?

Answer: To handle multiple windows or tabs in Selenium WebDriver with C#, you can use the SwitchTo() method to switch the focus to the desired window or tab. Here's an example:

using OpenQA.Selenium;

// Get the current window handle
string currentWindowHandle = driver.CurrentWindowHandle;

// Get the handles of all open windows
List<string> windowHandles = driver.WindowHandles.ToList();

// Switch to a new window
driver.SwitchTo().Window(windowHandles[1]);

// Switch back to the original window
driver.SwitchTo().Window(currentWindowHandle);

Question: How do you perform mouse hover actions in Selenium WebDriver with C#?

Answer: To perform mouse hover actions in Selenium WebDriver with C#, you can use the Actions class from the OpenQA.Selenium.Interactions namespace. Here's an example:

using OpenQA.Selenium.Interactions;

// Create an instance of the Actions class
Actions actions = new Actions(driver);

// Move the mouse to the element
actions.MoveToElement(element).Perform();

Question: How do you capture screenshots in Selenium WebDriver with C#?

Answer: To capture screenshots in Selenium WebDriver with C#, you can use the ITakesScreenshot interface. Here's an example:

using OpenQA.Selenium;

// Capture a screenshot
Screenshot screenshot = ((ITakesScreenshot)driver).GetScreenshot();

// Save the screenshot to a file
screenshot.SaveAsFile("path/to/screenshot.png", ScreenshotImageFormat.Png);

Question: How do you handle browser cookies in Selenium WebDriver with C#?

Answer: To handle browser cookies in Selenium WebDriver with C#, you can use the Cookies property of the IWebDriver interface. Here's an example:

using OpenQA.Selenium;

// Get all cookies
var cookies = driver.Manage().Cookies.AllCookies;

// Add a new cookie
driver.Manage().Cookies.AddCookie(new Cookie("name", "value"));

// Delete a cookie
driver.Manage().Cookies.DeleteCookieNamed("cookieName");

Question: How do you perform scrolling in Selenium WebDriver with C#?

Answer: To perform scrolling in Selenium WebDriver with C#, you can use JavaScript execution. Here’s an example:

using OpenQA.Selenium;

// Scroll to the bottom of the page
((IJavaScriptExecutor)driver).ExecuteScript("window.scrollTo(0, document.body.scrollHeight)");

// Scroll to a specific element
((IJavaScriptExecutor)driver).ExecuteScript("arguments[0].scrollIntoView(true);", element);

Question: How do you handle synchronization or waits in Selenium WebDriver with C#?

Answer: To handle synchronization or waits in Selenium WebDriver with C#, you can use the WebDriverWait class from the OpenQA.Selenium.Support.UI namespace. Here's an example:

using OpenQA.Selenium;
using OpenQA.Selenium.Support.UI;

// Wait for an element to be visible
WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
wait.Until(ExpectedConditions.ElementIsVisible(By.Id("elementId")));

Question: How do you generate test reports in Selenium WebDriver with C#?

Answer: Selenium WebDriver with C# does not provide built-in test reporting. However, you can use third-party libraries like NUnit or SpecFlow to generate test reports. These frameworks provide features for test organization, assertions, and test result reporting.

Question: How do you handle test data in Selenium WebDriver with C#?

Answer: Test data can be handled in Selenium WebDriver with C# by using various approaches:

  • Reading test data from external files like Excel, CSV, or JSON.
  • Using data providers or test data factories to generate test data dynamically.
  • Storing test data in variables or constants within the test code.

Question: How do you handle browser navigation in Selenium WebDriver with C#?

Answer: Selenium WebDriver provides navigation methods to handle browser navigation, such as:

  • Navigate().GoToUrl("url") - Navigates to a specified URL.
  • Navigate().Back() - Navigates back to the previous page.
  • Navigate().Forward() - Navigates forward to the next page.
  • Navigate().Refresh() - Refreshes the current page.

Question: How do you handle browser window resizing in Selenium WebDriver with C#?

Answer: You can handle browser window resizing in Selenium WebDriver with C# using the Manage().Window property. Here's an example:

using OpenQA.Selenium;

// Maximize the browser window
driver.Manage().Window.Maximize();

// Set the browser window size
driver.Manage().Window.Size = new Size(800, 600);

Question: How do you handle browser authentication prompts in Selenium WebDriver with C#?

Answer: Selenium WebDriver with C# does not have built-in support for handling browser authentication prompts. However, you can include the username and password in the URL itself, like "http://username:password@example.com", to bypass the authentication prompt.

Question: How do you handle browser-specific issues in Selenium WebDriver with C#?

Answer: To handle browser-specific issues in Selenium WebDriver with C#, you can use browser-specific capabilities or options. For example, when using ChromeDriver, you can set specific options like --start-maximized for maximizing the browser window or --headless for running in headless mode.

Question: How do you handle file uploads in Selenium WebDriver with C#?

Answer: To handle file uploads in Selenium WebDriver with C#, you can use the SendKeys() method to enter the file path into the file input element. For example:

IWebElement fileInput = driver.FindElement(By.Id("fileInput"));
fileInput.SendKeys("path/to/file.txt");

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Mayank Gupta

QA Automation Lead | Web Automation | Mobile Automation | API Automation l Performance | Web Security | IOT | Blockchain