/// <summary>
        /// Update entity
        /// </summary>
        /// <param name="entity">Entity</param>
        public virtual void Update(T entity)
        {
            try
            {
                if (entity == null)
                    throw new ArgumentNullException("entity");

                this.Entities.Attach(entity);
                this._context.ObjectStateManager.ChangeObjectState(entity, System.Data.EntityState.Modified)

                this._context.SaveChanges();
            }
            catch (DbEntityValidationException dbEx)
            {
                var msg = string.Empty;

                foreach (var validationErrors in dbEx.EntityValidationErrors)
                    foreach (var validationError in validationErrors.ValidationErrors)
                        msg += Environment.NewLine + string.Format("Property: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage);

                var fail = new Exception(msg, dbEx);
                //Debug.WriteLine(fail.Message, fail);
                throw fail;
            }
        }