Iterating through IQueryable with foreach results in an out of memory exception

I'm iterating through a smallish (~10GB) table with a foreach / IQueryable and LINQ-to-SQL. Looks something like this:

using (var conn = new DbEntities() { CommandTimeout = 600*100})
{
     var dtable = conn.DailyResults.Where(dr => dr.DailyTransactionTypeID == 1);
     foreach (var dailyResult in dtable)
     {
        //Math here, results stored in-memory, but this table is very small. 
        //At the very least compared to stuff I already have in memory. :)
     }
}

The Visual Studio debugger throws an out-of memory exception after a short while at the base of the foreach loop. I'm assuming that the rows of dtable are not being flushed. What to do?