Clear SearchSort FilterExpression

<p>I am using the SearchSort functionality to find records in my table. If the user searches for something that doesn't exist I was hoping to use the "NoItemsTemplate" to show a simple message "No records found" and a CommandButton that would reset the select statement to my initial SELECT * FROM.... However, I can't seem to get the select statement to work. The command button works (I think) but the data is never refreshed. </p>