Is it possible to limit the amount of results returned in a response when using a QueryExpression in CRM 4

In a QueryExpression:

QueryExpression query = new QueryExpression(); 
query.PageInfo = new PagingInfo();
query.PageInfo.Count = 200; // or 50, or whatever
query.PageInfo.PageNumber = 1;

In Fetch XML:

<fetch mapping='logical' page='1' count='200'>
...