/// <summary>
        /// ���ݻID��������ID����������ID�ж�ij�����Ƿ��Ѿ���ij�����
        /// </summary>
        /// <param name="AccountID"></param>
        /// <param name="InviteID"></param>
        /// <param name="ActiveitesID"></param>
        /// <returns></returns>
        public IList<ActivitiesInvite> Get(long AccountID, long InviteID, int ActiveitesID)
        {
            IList<Core.Business.ActivitiesInvite> activitiesInvitelist = new List<Core.Business.ActivitiesInvite>();
            SqlServerUtility sql = new SqlServerUtility(connectionString);
            string sqlwhere = "AccountID=" + AccountID + " and InviteID=" + InviteID + " and ActiveitesID=" + ActiveitesID + "";
            sql.AddParameter("@WhereCondition", SqlDbType.NVarChar, sqlwhere);
            sql.AddParameter("@OrderByExpression",SqlDbType.NVarChar,"InviteaTime desc");
            SqlDataReader reader = sql.ExecuteSPReader("usp_SelectActivitiesInvitesDynamic");

            if (reader != null)
            {
                while (reader.Read())
                {
                    Core.Business.ActivitiesInvite activitiesInvite = new Core.Business.ActivitiesInvite();

                    if (!reader.IsDBNull(0)) activitiesInvite.Id = reader.GetInt32(0);
                    if (!reader.IsDBNull(1)) activitiesInvite.AccountID = reader.GetInt64(1);
                    if (!reader.IsDBNull(2)) activitiesInvite.InviteID = reader.GetInt64(2);
                    if (!reader.IsDBNull(3)) activitiesInvite.InviteaTime = reader.GetDateTime(3);
                    if (!reader.IsDBNull(4)) activitiesInvite.ActiveitesID = reader.GetInt32(4);

                    activitiesInvite.MarkOld();
                    activitiesInvitelist.Add(activitiesInvite);
                }
                reader.Close();
            }
            return activitiesInvitelist;
        }
        public IList<Core.Business.ActivitiesInvite> GetAllActivitiesInvite()
        {
            IList<Core.Business.ActivitiesInvite> activitiesInvitelist = new List<Core.Business.ActivitiesInvite>();
            SqlServerUtility sql = new SqlServerUtility(connectionString);

            SqlDataReader reader = sql.ExecuteSPReader("usp_SelectActivitiesInvitesAll");

            if(reader != null)
            {
                while(reader.Read())
                {
                    Core.Business.ActivitiesInvite activitiesInvite = new Core.Business.ActivitiesInvite();

                    if (!reader.IsDBNull(0)) activitiesInvite.Id = reader.GetInt32(0);
                    if (!reader.IsDBNull(1)) activitiesInvite.AccountID = reader.GetInt64(1);
                    if (!reader.IsDBNull(2)) activitiesInvite.InviteID = reader.GetInt64(2);
                    if (!reader.IsDBNull(3)) activitiesInvite.InviteaTime = reader.GetDateTime(3);
                    if (!reader.IsDBNull(4)) activitiesInvite.ActiveitesID = reader.GetInt32(4);

                    activitiesInvite.MarkOld();
                    activitiesInvitelist.Add(activitiesInvite);
                }
                reader.Close();
            }
            return activitiesInvitelist;
        }
        public Core.Business.ActivitiesInvite Select(int id)
        {
            SqlServerUtility sql = new SqlServerUtility(connectionString);

            sql.AddParameter("@Id", SqlDbType.Int, id);
            SqlDataReader reader = sql.ExecuteSPReader("usp_SelectActivitiesInvite");

            if (reader != null && !reader.IsClosed && reader.Read())
            {
                Core.Business.ActivitiesInvite activitiesInvite = new Core.Business.ActivitiesInvite();

                if (!reader.IsDBNull(0)) activitiesInvite.Id = reader.GetInt32(0);
                if (!reader.IsDBNull(1)) activitiesInvite.AccountID = reader.GetInt64(1);
                if (!reader.IsDBNull(2)) activitiesInvite.InviteID = reader.GetInt64(2);
                if (!reader.IsDBNull(3)) activitiesInvite.InviteaTime = reader.GetDateTime(3);
                if (!reader.IsDBNull(4)) activitiesInvite.ActiveitesID = reader.GetInt32(4);

                reader.Close();
                return activitiesInvite;
            }
            else
            {
                if (reader != null && !reader.IsClosed)
                    reader.Close();

                return null;
            }
        }