using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel.DomainServices.EntityFramework;
using System.ServiceModel.DomainServices.Hosting;
using System.ServiceModel.DomainServices.Server;
using System.ServiceModel.DomainServices.Server.ApplicationServices;
using System.Web.Security;

namespace SilverlightApplication5.Web
{
    [EnableClientAccess]
    public class AuthenticationService : LinqToEntitiesDomainService<MMDatabaseEntities>, IAuthentication<User>
    {
        private static readonly User DefaultUser = new User
        {
            ISN = 0,
            Name = string.Empty,
            Password = string.Empty,
            DbRoles = string.Empty,
            Comment = string.Empty, //именно такие столбцы в таблице
        };

        public User Login(string userName, string password, bool isPersistent, string customData)
        {
            if (ValidateUser(userName, password))
            {
                FormsAuthentication.SetAuthCookie(userName, isPersistent);
                return GetUser(userName);
            }
            return null;
        }
 
        //логика авторизации, валидации, гетюзерс...
    }

    public partial class User : IUser
    {
        [DataMember]
        public IEnumerable<string> Roles
        {
            get { return DbRoles.Split(','); }
            set { DbRoles = string.Join(",", value.ToArray()); }
        }
        
        public string MyTextInfo { get; set; }
    }
}

    <profile enabled="true">
      <properties>
        <add name="BackgroundColor" defaultValue="red"/>
      </properties>
    </profile>