How To Create Login Page In Blazor Server

How To Articles

I remember when I first started building web applications, one of the fundamental functionalities I had to implement was a login page. In this article, I will guide you through the process of creating a login page in Blazor Server, a powerful framework that enables you to build interactive web applications with .NET. So, grab your favorite code editor and let’s dive into the fascinating world of Blazor Server!

Getting Started with Blazor Server

Before we jump into creating a login page, let’s make sure we have a solid understanding of Blazor Server. Blazor Server is a web development framework that allows you to build full-featured, interactive web applications using C# instead of JavaScript. It leverages SignalR to provide real-time communication between the server and the client.

To get started with Blazor Server, you’ll need to have the following prerequisites:

  1. .NET Core SDK
  2. A code editor (Visual Studio, Visual Studio Code, or any other code editor of your choice)

Once you have the necessary tools set up, you can create a new Blazor Server project by running the following command in your terminal or command prompt:

dotnet new blazorserver -n MyLoginApp

This command creates a new Blazor Server project named “MyLoginApp”. Feel free to choose a different name if you prefer.

Designing the Login Page

Now that we have our Blazor Server project set up, let’s move on to designing our login page. In Blazor Server, you can create reusable UI components using Razor syntax. Razor syntax allows you to seamlessly integrate C# code within your HTML markup.

Open the _Imports.razor file located in the Shared folder of your project. Add the following line of code to import the necessary namespaces:

@using Microsoft.AspNetCore.Identity

Next, create a new component named LoginForm.razor in the Shared folder. In this component, we’ll define the structure and functionality of our login form.

Here’s a basic implementation of the LoginForm component:

@page "/login"
@inject SignInManager SignInManager
@inject UserManager UserManager


@if (SignInManager.IsSignedIn(UserManager.GetUserId(User)))

You are already logged in.



In the above code, we first check if the user is already logged in. If they are, we display a message indicating so. Otherwise, we render the login form, which consists of two input fields for email and password, along with a submit button.

Feel free to add more fields or customize the form to suit your needs. Remember to handle form submission and implement the necessary authentication logic in your server-side code.

Creating the Login Functionality

Now that we have our login form designed, let’s move on to implementing the login functionality. In Blazor Server, you can handle form submissions and server-side interactions using C# methods in your components.

Open the LoginForm.razor component and add a method named Login to handle the form submission:

private async Task Login()
// Implement the login logic here

Inside the Login method, you can use the SignInManager and UserManager instances to handle the authentication process. This may involve validating the user’s credentials, checking for account lockouts, and setting the appropriate authentication cookies.

For security reasons, it’s recommended to use a secure password hashing algorithm and protect against brute-force attacks. You can leverage the built-in features of ASP.NET Core Identity to handle these aspects.


Creating a login page in Blazor Server is a crucial step in developing modern web applications. Blazor Server provides a powerful and intuitive framework for building interactive UIs with the comfort of C#.

In this article, we explored the basics of Blazor Server, designed a login form using Razor syntax, and discussed the implementation of the login functionality. Remember to customize the form according to your specific requirements and ensure proper security measures are in place.

Now that you have the knowledge and tools to create a login page in Blazor Server, I encourage you to explore further and build upon this foundation. Happy coding!