Asp net mvc identity email username with special characters

ASP.NET is a widely used programming language for developing web applications. It provides a powerful framework for building and interactive websites. One requirement in web development is to handle special characters in various fields, such as email addresses and usernames. In this article, we will explore how to handle special characters in ASP.NET MVC Identity for email and fields.

ASP.NET MVC Identity is a framework that provides a robust and way to manage user authentication and authorization in ASP.NET applications. It includes built-in support for handling user registration, login, and password management. However, by default, it does not special characters in email and username fields.

To enable special characters in email and username fields, we need to customize the ASP.NET MVC Identity configuration. This can be done by modifying the ApplicationUser class, which represents the user entity in the application.

Customizing the ApplicationUser Class

The step is to modify the ApplicationUser class to allow special characters in the email and username fields. Open the IdentityModels.cs file in your ASP.NET MVC project and locate the ApplicationUser class. Add the following code to the class:

public class ApplicationUser : IdentityUser
    // Add additional properties here

    [RegularExpression(@"^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$", ErrorMessage = "Invalid email ")]
    public override  Email { get; set; }

    [RegularExpression(@"^[a-zA-Z0-9_]+$", ErrorMessage = "Invalid username")]
    public override string UserName { get; set; }

In the code above, we have added expressions to validate the email and username fields. The regular expression for the email field allows special characters such as “.”, “+”, and “-“. The regular expression for the username field allows alphanumeric characters and underscores.

Updating the Database Schema

After modifying the ApplicationUser class, we need to update the database schema to reflect the changes. Open the Package Manager Console in Studio and run the following command:


This command will apply the changes to the database schema and update the tables related to ASP.NET MVC Identity.

Handling Special Characters in User Registration

With the ApplicationUser class and the database schema updated, we can now handle special characters in user registration. Let's consider an example where a user registers with an email address and username that contain special characters.

// Create a new user
var user = new ApplicationUser
    Email = "",
    UserName = "john_doe"

// Register the user
var result = await UserManager.CreateAsync(user, "P@ssw0rd");

In the code above, we create a new instance of the ApplicationUser class and set the email and username properties to values that contain special characters. We then use the UserManager class, provided by ASP.NET MVC Identity, to register the user. The CreateAsync method will validate the email and username fields based on the regular expressions we defined earlier.


In this article, we have explored how to handle special characters in ASP.NET MVC Identity for email and username fields. By customizing the ApplicationUser class and updating the database schema, we can allow special characters in these fields. This customization gives developers more flexibility in handling user registration and authentication in ASP.NET applications.

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