In Selenium with C#, a page object is a class that gives tests a clear interface to a web page or reusable page region. Keep locators and page-specific browser operations inside that class; keep assertions about application behavior in the test. This separation reduces duplicated UI knowledge and helps localize changes when the interface changes, without eliminating test maintenance.
What the Page Object Model does
A page object is an object-oriented interface to a page or application component. It centralizes knowledge of the page’s HTML and locators, along with operations a test can perform there. Tests call methods that describe intent—such as entering credentials—rather than repeating selectors and low-level browser interactions.
Selenium’s official Page Object Models guidance illustrates the pattern in Java. The design principles apply to C#, but Java examples are not C# implementations; use the Selenium Page Object Models documentation for the general guidance and the Selenium .NET API docs for exact C# APIs.
What belongs in a page object
- Locators and knowledge of the page’s structure.
- Operations the page offers, expressed in intention-revealing methods.
- Information a test needs to inspect, exposed through a useful property or method.
- Navigation behavior that can return an object representing the destination page.
What generally stays in the test
Assertions about expected application behavior belong in the test. Selenium’s guidance states, “Page objects themselves should never make verifications or assertions.” A narrow exception is checking that the expected page loaded when constructing its page object. That is a page-identity or readiness check, not an assertion that the business outcome was correct.
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Set up Selenium for C#
Selenium’s current getting-started guide lists .NET SDK 8.0 or later for its .NET test-suite path, which uses dotnet restore and dotnet test. It separately lists .NET 10 or later for running the standalone file-based HelloSelenium.cs script. These are different workflows; the standalone requirement does not mean every Selenium C# project needs .NET 10. Check the Selenium first-script guide before setup because SDK guidance can change.
The Selenium documentation names Rider and Visual Studio Code as IDE options, not requirements. Selenium’s .NET API documentation exposes the Selenium.WebDriver and Selenium.Support modules. Consult its current .NET API docs when you need exact signatures.
Build a simple LoginPage
The following is an illustrative C# pattern, not code copied from Selenium’s Java example. It assumes a test project with Selenium WebDriver available, a configured browser driver, and a login page whose controls match the sample selectors. Replace the URL and selectors with those for your application.
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Page objects
Keep locators private and expose operations in terms of what the page does. This example returns a HomePage after submitting credentials; the destination object’s construction check confirms the expected page has loaded.
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using OpenQA.Selenium.Support.UI;
public sealed class LoginPage
{
private readonly IWebDriver _driver;
private readonly By _username = By.Id("username");
private readonly By _password = By.Id("password");
private readonly By _submit = By.CssSelector("button[type='submit']");
public LoginPage(IWebDriver driver)
{
_driver = driver;
if (!driver.Url.Contains("/login", StringComparison.OrdinalIgnoreCase))
{
throw new InvalidOperationException("Expected the login page.");
}
}
public HomePage LoginAs(string username, string password)
{
_driver.FindElement(_username).SendKeys(username);
_driver.FindElement(_password).SendKeys(password);
_driver.FindElement(_submit).Click();
return new HomePage(_driver);
}
}
public sealed class HomePage
{
private readonly IWebDriver _driver;
private readonly By _heading = By.CssSelector("h1");
public HomePage(IWebDriver driver)
{
_driver = driver;
}
public string Heading => _driver.FindElement(_heading).Text;
}LoginAs, HomePage, and the selectors are application-design examples, not Selenium-defined APIs. The sample’s URL check is deliberately simple; for a real application, validate a stable page identity appropriate to its routes and redirects.
Keep the test responsible for the outcome
Create the driver in test setup, pass it into the page object, and make the expected result explicit in the test. The exact test framework and driver lifecycle depend on your project.
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// Illustrative test body; create and dispose driver using your test framework's setup.
driver.Navigate().GoToUrl("https://example.test/login");
var login = new LoginPage(driver);
var home = login.LoginAs("alex", "correct-password");
Assert.AreEqual("Welcome, Alex", home.Heading);The assertion is visible beside the scenario that requires it. If the application changes its heading or its success behavior, the test states clearly what needs reconsideration.
Model expected login failure
A failed login is a separate outcome, so give it a clear operation or result rather than embedding an assertion inside LoginPage. For example, an operation could submit credentials and return a result object exposing the displayed error text; the test then asserts that text. This keeps the page’s interaction model reusable while leaving the expected error message as a test expectation.
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Represent repeated regions as components
A page object does not have to represent an entire page. If the same navigation bar, account menu, or other region appears on multiple pages, model it as a component object and compose it into the page objects that contain it. That makes reuse explicit without creating a sprawling base class.
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For example, a NavigationBar component could own its menu locators and provide methods such as OpenAccountMenu. A page that contains it can expose the component as a property. Keep the component’s public methods focused on the services that region offers; Selenium describes public page or component methods as representing those services.
Design choices that keep POM useful
| Choice | What it changes | Useful when |
|---|---|---|
| Locators repeated in test code | Each test carries some knowledge of the page HTML, so a selector change can touch multiple tests. | Only for very small throwaway checks; it becomes costly as scenarios repeat. |
| Page object per page | Page structure and operations are centralized, and tests read in terms of page actions. | Most pages with distinct behaviors and stable responsibilities. |
| Composed component objects | Repeated regions have their own locators and operations, reused across pages. | Shared navigation, headers, or other meaningful repeated sections. |
Avoid both extremes: duplicating selectors throughout tests and hiding all behavior in a giant base class. Selenium advises that page objects should seldom expose the underlying driver. Prefer methods that express page services over a general-purpose wrapper around every WebDriver command.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Run and maintain the test suite
- Choose the Selenium .NET test-suite setup in the official getting-started guide and meet its .NET SDK 8.0-or-later prerequisite.
- Restore the example project’s dependencies with
dotnet restore. - Run the tests with
dotnet test. - When a UI change breaks tests, update the affected page or component object’s locator or operation, then review the test expectation if the application behavior also changed.
The separate standalone HelloSelenium.cs route has the .NET 10-or-later requirement described above; do not substitute it for the test-suite path unless that is the workflow you intend to use.
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Troubleshoot common POM problems
- Element not found: First verify that the locator matches the current page markup and that navigation has completed. Keep the locator in the page or component object so the correction is centralized.
- Click or lookup happens too early: A page may not be ready immediately after navigation or submission. Add a wait for a meaningful page condition, using Selenium’s current .NET API signatures rather than importing Java syntax verbatim.
- Page-object constructor fails after redirect: The application may redirect to a different route than the simple sample expects. Adjust the page-identity check to match the intended destination, or construct the destination object only after the flow has reached it.
- Tests become hard to understand: If a page object contains scenario-specific assertions or returns low-level driver details, move expectations back into tests and make the public page methods describe user-relevant operations.
- Repeated page changes require edits everywhere: Move duplicated selectors or repeated-region behavior into a page object or composed component. POM localizes maintenance; it cannot prevent updates when the application or its expected behavior changes.
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Frequently Asked Questions
Does Selenium’s official Page Object Model example use C#?
No. The cited Page Object Models page demonstrates the principles in Java; its example should not be treated as C# syntax.
Do page objects need to expose IWebDriver?
Usually not. Keep the driver as an implementation detail and expose operations or information that represent the page or component.
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