Context aware entities in Entity Framework

gistfile1.cs

public partial class CountryShardedDatabase
    {
        public static CountryShardedDatabase FromCountry(string country)
        {
            var db = new CountryShardedDatabase(string.Format("name={0}", ConfigurationManager.ConnectionStrings[country].Name));
            db.Country = country;

            db.ObjectMaterialized += new System.Data.Objects.ObjectMaterializedEventHandler(db_ObjectMaterialized);

            return db;
        }

        static void db_ObjectMaterialized(object sender, System.Data.Objects.ObjectMaterializedEventArgs e)
        {
            var db = sender as CountryShardedDatabase;
            var user = e.Entity as User;
            if (db != null && user != null)
            {
                user.Country = db.Country;
            }
        }

        public string Country { get; set; }
    }