EF在Sql-Server中添加没有用户ID的用户

public class User
{
    public string UserName { get; set; }
    public string Password { get; set; }
}

public class ApplicationDbContext : DbContext
{
    public DbSet<User> Users { get; set; }
}

public ApplicationDbContext()
    : base("name=ConnectionStringName")
{
}

using (var context = new ApplicationDbContext())
{
    context.Database.CreateIfNotExists();
}

using (var context = new ApplicationDbContext())
{
    var user = new User
    {
        UserName = "JohnDoe",
        Password = "password123"
    };

    context.Users.Add(user);
    context.SaveChanges();
}