Asp Net Core Windows Authentication Login Page

How To Articles

ASP.NET Core is a powerful framework for building web applications, and one important aspect of web development is user authentication. In this article, I will guide you through the process of creating a Windows authentication login page using ASP.NET Core.

Windows authentication is a secure and efficient way to authenticate users in an ASP.NET Core application. It allows users to log in using their Windows credentials, eliminating the need for separate username and password combinations.

Getting Started

To get started, you’ll need to create a new ASP.NET Core application or open an existing one. If you don’t have one yet, you can easily create a new project using the .NET Core CLI or Visual Studio.

Once you have your project set up, the first step is to enable Windows authentication. Open the `Startup.cs` file in your project and add the following code inside the `ConfigureServices` method:


This code configures the application to use Windows authentication as the default authentication scheme.

Adding the Login Page

Next, we need to create the login page. In ASP.NET Core, you can create your views using Razor syntax. Add a new View to your project and name it `Login.cshtml`.

Inside the `Login.cshtml` file, you can design your login page as you wish. You can use HTML, CSS, and Razor syntax to create a user-friendly and visually appealing login form. You can also add additional fields or customize the layout to match your application’s design.

Here’s a basic example of a login form:

<form method="post" asp-route-returnUrl="@ViewData["ReturnUrl"]">
<input type="text" name="username" />
<input type="password" name="password" />
<button type="submit">Log In</button>

Make sure to replace the form action with the appropriate route to handle the login process in your application.

Handling the Login Process

Now that we have our login form, we need to handle the login process. Inside your controller, add a new action method to handle the login request:

public IActionResult Login(LoginViewModel model, string returnUrl)
if (ModelState.IsValid)
// Perform the authentication logic here

if (/* authentication successful */)
// Redirect the user to the original page or a specific page
return LocalRedirect(returnUrl);
ModelState.AddModelError("", "Invalid login attempt.");

return View(model);

In this action method, you can perform the necessary authentication logic. This could involve verifying the user’s credentials against a database or Active Directory. If the authentication is successful, you can redirect the user to the original page or any specific page in your application. If the authentication fails, you can display an error message on the login page.


Creating a Windows authentication login page in ASP.NET Core is a straightforward process. By enabling Windows authentication and designing a login form, you can provide a secure and convenient way for users to log in to your ASP.NET Core application.

Remember to ensure that appropriate security measures are in place to protect against unauthorized access and always follow security best practices when managing user credentials.

For more information and detailed documentation on ASP.NET Core authentication, you can visit the official Microsoft documentation.