How to use "Does not Contain" Filter

[amit4mins]

Hi,

I was trying to fetch new events using "Does not Contain" filter to filter out few event with some events id.
This is what we have tried till now:

            $startTime = $startDate.'T00:00:00'; // '2011-10-31T00:00:00';
            $endTime=$endDate."T00:00:00";

    $response = $this->SearchByFilter('Event', 'AndSearch', array(
                (object) array('Field' => 'EventStartDate', 'Operator' => 'Greater than', 'Value' => $startTime),
                (object) array('Field' => 'EventStartDate', 'Operator' => 'Less than', 'Value' => $endTime),
                (object) array('Field' => 'Id', 'Operator' => 'Does not Contain', 'ValueArray' => array('Value'=>"948CA139-F6F8-469D-B740-889BDBDD1BBA")),
              // also tried this
              //(object) array('Field' => 'Id', 'Operator' => 'Does not Contain', 'ValueArray' => (object) array('Value'=>"948CA139-F6F8-469D-B740-889BDBDD1BBA")),

                ));
    if(isset($response->SearchResult->Id)) return $response->SearchResult->Id;
    return false;

But its giving me error like : SoapFault : INVALID_SEARCH_FILTER.
Can you please have a look and let me know whats wrong with it.

Thanks,
A.