Error: The type or namespace UI does not exist in the namespace Microsoft.AspNetCore.Identity bootstrap dotnet core 3.0

Problem: The type or namespace UI does not exist in the namespace Microsoft.AspNetCore.Identity bootstrap dotnet core 3.0


Solution: If you had upgraded Microsoft.AspNetCore.Identity.UI version="3.0.0" Nuget Package to version="3.1.0", revert the changes. Simply right click on your project name and navigate to "Edit Project File" and find the version number version="3.1.0" and change it to version="3.0.0". Build your project and you will be good to go.

Error: The type or namespace UI does not exist in the namespace Microsoft.AspNetCore.Identity bootstrap dotnet core 3.0

Edited Version 2

Understanding and Implementing Identity with ASP.NET Core 3.0
A Deep Dive into Microsoft's Authentication Framework

ASP.NET Core is an open-source, cross-platform framework for building modern web applications. One of its most powerful features is Identity, an authentication and authorization framework that simplifies the process of adding user sign-in functionality to your applications. In this blog post, we'll explore the basics of Identity in ASP.NET Core 3.0, including its architecture, key components, and implementation steps.

**What is Identity in ASP.NET Core?**

Microsoft Identity is an authentication framework that provides built-in support for individual user sign-in, password storage, and other security features. It's designed to work seamlessly with ASP.NET Core applications, allowing developers to focus on building their applications rather than managing authentication and authorization details.

**Architecture of Identity in ASP.NET Core**

At its core, Identity consists of three main components

1. **Identity Framework**
This is the core library that provides the building blocks for authentication and authorization. It includes classes for managing users, roles, claims, and middleware components for handling authentication requests.

2. **Identity Data Store**
This is where user data is stored, such as usernames, passwords, and email addresses. In ASP.NET Core, Identity supports several data stores, including SQL Server, SQLite, and In-Memory.

3. **Identity UI**
This is an optional component that provides pre-built UI components for sign-in, registration, and password reset pages. It's built using Razor Pages and can be easily integrated into your application.

**Setting up Identity in ASP.NET Core**

To get started with Identity in ASP.NET Core, follow these steps

**Step 1
Create a new project**

First, create a new ASP.NET Core Web Application using Visual Studio or the .NET CLI


dotnet new webapp -o MyApp

**Step 2
Add Identity**

Next, add Identity to your project by installing the `Microsoft.AspNetCore.Identity.Stores` and `Microsoft.AspNetCore.Identity.UI` NuGet packages


dotnet add package Microsoft.AspNetCore.Identity.Stores

dotnet add package Microsoft.AspNetCore.Identity.UI

**Step 3
Configure Identity**

Open the `appsettings.json` file and add the following configuration















Replace the `DefaultConnection` value with your own SQL Server connection string.

Next, open the `Program.cs` file and add the following lines at the end


using Microsoft.EntityFrameworkCore;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Hosting;

using MyApp.Data;

using Microsoft.AspNetCore.Identity;

using Microsoft.AspNetCore.Identity.UI;

using Microsoft.AspNetCore.Identity.Stores;

public static IHostBuilder CreateHostBuilder(string[] args) =>


.ConfigureWebHostDefaults(webBuilder =>




webBuilder.UseIdentity(options =>


options.Password.RequireDigit = true;

options.Password.RequireLowercase = true;

options.Password.RequireUppercase = true;

options.Password.RequireNonAlphanumeric = true;

options.Password.RequiredLength = 6;





webBuilder.UseEndpoints(endpoints =>



Ahmet said:

Thanks man, it really helped.

Posted On: December 12, 2020 5:31:43 AM

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