Consider using a GridView - better choice for your requirement. You won't need a button. As soon as the user selects a row, it fires the Server Task. Use a Bound Parameter to associate the ID column in the table/grid. Pass the value of that parameter into the rule and use it to query the table to lookup the rest of the values. If you must use a button, be sure to pass in the value of the bound paramater in the GridView to the rule the button calls.
Thank you for it,
I need to make modifications to the database table, which is why I'm using the SQL table editor. Is it possible to use GridView for the purpose of modifying data?
