public Int32 DeleteContact(Guid ownerId, Guid userId)
        {
            s_log.LogInfo($@"Data provider's method '{nameof(DeleteContact)}({ownerId}, {userId})' is called");

            #region SQL Query
            var sqlQuery = @"
DELETE FROM contactsLists 
    WHERE OwnerId = @OwnerId
        AND UserId = @UserId
";
            #endregion

            using (IDbConnection connection = new SqlConnection(_dbSettings.DbConnectionString))
            {
                using (CDbTransactionQueryExecutor executor = new CDbTransactionQueryExecutor(connection))
                {
                    try
                    {
                        var result = executor.DeleteItem(sqlQuery,
                                                         SSqlParameterCreator.Create(
                                                             "@OwnerId", ownerId, System.Data.SqlDbType.UniqueIdentifier, false
                                                             ),
                                                         SSqlParameterCreator.Create(
                                                             "@UserId", userId, System.Data.SqlDbType.UniqueIdentifier, false
                                                             )
                                                         );

                        executor.Commit();
                        return(result);
                    }
                    catch (SqlException e)
                    {
                        s_log.LogError($@"{nameof(DeleteContact)}({ownerId}, {userId}): Error occured during SQL query execution", e);
                        s_log.LogInfo($@"{nameof(DeleteContact)}({ownerId}, {userId}): Operation was rolled back because of error");
                        Console.WriteLine($@"{nameof(DeleteContact)}({ownerId}, {userId}): Error occured during SQL query execution");
                        Console.WriteLine("Operation was rolled back because of error");
                        return(0);
                    }
                }
            }
        }