SSIS - Can we use Variables in a Data Flow Task SQL command ?

Hi,

In my SSIS Data Flow Task, I have a query that retrieves data based on a couple of date parameters. Is there a way we can pass/use the Variables defined in the SSIS package in the query ?

(I am assigning values to those variables from C# code)

The query should look like this:

select ordernumber, customerid from salesorder

where statecode=3 and datefulfilled between @variable1 and @variable2

Please help .