Today I tried authentication by ASP.NET Core Identity. What I did 1. Create custom IdentityUser 2. Create a route for authentication 3. After authentication, access authorized route Setup Most of all environments were same as previous post. I only installed Microsoft.AspNetCore.Identity.EntityFrameworkCore (ver.3.0.0) by NuGet. Add user table I added user table to DB. CREATE TABLE "User" ( "UserId" serial PRIMARY KEY, "Name" text not null, "Password" text not null ) 1. Create custom IdentityUser First, I created custom IdentityUser for signing in. Because the default IdentityUser had had so many properties. But I only wanted three things below. Id UserName Password ApplicationUser I could created custom user class by inheritting IdentityUser class. ApplicationUser.cs using System; using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema; using Microsoft.AspNetCore.Identity; names...