/// <summary>
        /// 
        /// </summary>
        /// <param name="virtualDealerID"></param>
        /// <returns></returns>
        internal string DeleteVirtualDealer(int virtualDealerID)
        {
            string result = "-1";
            System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection(DBConnection.DBConnection.Connection);
            DSTableAdapters.VirtualDealerTableAdapter virtualDealerAdap = new DSTableAdapters.VirtualDealerTableAdapter();
            DSTableAdapters.IVirtualDealerTableAdapter iVirtualDealerAdap = new DSTableAdapters.IVirtualDealerTableAdapter();
            DSTableAdapters.VirtualDealerConfigTableAdapter configDealerAdap = new DSTableAdapters.VirtualDealerConfigTableAdapter();
            System.Data.SqlClient.SqlTransaction trans = null;
            try
            {
                conn.Open();
                trans = conn.BeginTransaction();

                configDealerAdap.Connection = conn;
                configDealerAdap.Transaction = trans;
                configDealerAdap.DeleteVirtualConfigByVirtualDealerID(virtualDealerID);

                iVirtualDealerAdap.Connection = conn;
                iVirtualDealerAdap.Transaction = trans;
                iVirtualDealerAdap.DeleteByVirtualDealerID(virtualDealerID);

                virtualDealerAdap.Connection = conn;
                virtualDealerAdap.Transaction = trans;
                int resultDelete = virtualDealerAdap.DeleteVirtualDealer(virtualDealerID);

                if (resultDelete == 0)
                {
                    throw new Exception("Data error");
                }
                result = resultDelete.ToString();
                trans.Commit();
            }
            catch (Exception ex)
            {
                trans.Rollback();
                return "Data error";
            }
            finally
            {
                virtualDealerAdap.Connection.Close();
                iVirtualDealerAdap.Connection.Close();
                configDealerAdap.Connection.Close();
                conn.Close();
            }

            return result;
        }