Acc servic

IMPLEMETS
public class AuthService : IAuthService
{
readonly UserManager _userManager;
readonly SignInManager _signInManager;

    public AuthService(UserManager<IdentityUser> userManager, SignInManager<IdentityUser> signInManager)
    {
        _signInManager = signInManager;
        _userManager = userManager;
    }
    public async Task Login(LoginDTO loginDTO)
    {
        IdentityUser? userDB = await _userManager.FindByEmailAsync(loginDTO.Email);
        if (userDB is null)
        {
            throw new Exception("Credentials are not correct.");
        }
        bool isAllowed = await _userManager.CheckPasswordAsync(userDB, loginDTO.Password);
        if (!isAllowed)
        {
            throw new Exception("Credentials are not correct.");
        }
        await _signInManager.SignInAsync(userDB,true);
    }


    public async Task Register(RegisterDTO registerDTO)
    {
        IdentityUser user = new IdentityUser()
        {
            Email = registerDTO.Email,
            UserName = registerDTO.UserName,
        };
        IdentityResult result = await _userManager.CreateAsync(user, registerDTO.Password);
        if (result.Succeeded)
        {
            await _userManager.AddToRoleAsync(user,"User");
        }
    }
    public async Task Logout()
    {
        await _signInManager.SignOutAsync();
    }
}

}

INTERFACE
public interface IAuthService
{
public Task Login(LoginDTO loginDTO);
public Task Register(RegisterDTO registerDTO);
public Task Logout();
}

AuthDTO
public class LoginDTO
{
[Required]
public string UserName { get; set; }
[Required]
public string Email { get; set; }
[Required]
public string Password { get; set; }
}

public class RegisterDTO
{
[Required(ErrorMessage = "Username is required")]
[StringLength(16, ErrorMessage = "Must be between 3 and 16 characters", MinimumLength = 3)]
public string UserName { get; set; }

 [Required(ErrorMessage = "Email is required")]
 [StringLength(16, ErrorMessage = "Must be between 5 and 50 characters", MinimumLength = 5)]
 [RegularExpression("^[a-zA-Z0-9_.-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$", ErrorMessage = "Must be a valid email")]
 public string Email { get; set; }

 [Required(ErrorMessage = "Password is required")]
 [StringLength(255, ErrorMessage = "Must be between 5 and 255 characters", MinimumLength = 5)]
 [DataType(DataType.Password)]
 public string Password { get; set; }
 [Required(ErrorMessage = "Confirm Password is required")]
 [StringLength(255, ErrorMessage = "Must be between 5 and 255 characters", MinimumLength = 5)]
 [DataType(DataType.Password)]
 [Compare("Password")]
 public string RepeatPassword { get; set; }

}