Post some code, we may be able to help then. Also, from the sounds of it, you may want to ensure you are using the IsPostBack state properly. regards, Paul Watson Bluegrass South Africa Brian Welsch wrote: "blah blah blah, maybe a potato?" while translating my Afrikaans. Crikey! ain't life grand? Einstein says...

Unless you're using auto-postback, you'll need to use client-side Javascript to do this. Remember that ASP.NET describes server-side code written in a language that targets the CLR. Only some basic javascript is necessary for some ASP.NET controls to work, but anything in HTML (what ASP.NET generates for most classes) that must change without hitting the server must be performed by client-side script. So, either set AutoPostBack to true on your first drop-down, or pass all necessary data to both drop-downs and use some javascript and event handlers on the drop-downs (client-side event handlers) to select the appropriate data. -----BEGIN GEEK CODE BLOCK----- Version: 3.21 GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++ -----END GEEK CODE BLOCK-----

look up the formulas and move them into methods I'm not an expert yet, but I play one at work. Yeah and here too.

That sounds like the perfect title for a book: I Dream of Absolute Zero .. Have no idea what it would be about though.. "..Even my comments have bugs!" Inspired by Toni78