Linq to SQL - Multiple where clauses at runtime

Question

I am trying to accomplish this but only my first where clause is getting used when the query runs.

This needs to for for .Net 3.5 so the WhereIf in 4.0 is not usable.

var query =
    from tb in dataContext.TableOne
    where tb.DateTimeCreated >= fromDate && 
        tb.DateTimeCreated <= toDate.AddDays(1) 
    select tb;

if (!string.IsNullOrEmpty(reference))
{
    query.Where(tb => tb.Reference = reference));
}

Answer 1

  if (!string.IsNullOrEmpty(reference))
        query = query.Where(tb => tb.Reference = reference));

Answer 2

Try

Just do it in "one"

var query = (from tb in dataContext.TableOne
                      where (tb.DateTimeCreated >= fromDate && tb.DateTimeCreated <= toDate.AddDays(1)) && (string.IsNullOrEmpty(reference) || tb.Reference == reference)
                      select tb
               );

or as Ives says, do:

query = query.Where(...)