Michael: Thanks for the quick response. If I understand you correctly, what you are implying that I should do is something like the following. Let's say that a portion of my SelectCommand of the SqlDataSource looks like so (this is Oracle P-SQL): "..... where EXTRACT( MONTH from mh.historydatetime) = :MONTH_ID" Now, the bind-variable comes from the SelectedIndex of the drop down combo box. What you are saying to do, in essence is something like the following: "..... where EXTRACT( MONTH from mh.historydatetime) = :MONTH_ID AND :TIMESTAMP_INFO = :SUBMIT_TIME" That sounds quite difficult. For one: how do I put the timestamp info into a variable? Secondly, what is the logic behind this? As long as a different month is selected from the drop down, it should use the new data, right? Regards, Rob