---

I've made a prog (my first) which has some textboxes/combos that is used in
the calculations.
The program works fine if i fill out everything, but if i forget to fill out
f.ex one textbox, then i get this message:

Cast from string "" to type 'Double' is not valid

Any1 that could tell me what to do?

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"Tor-Arne Jensen" <torarneg@stud.ntnu.no> skrev i en meddelelse
news:lJHc9.13106$0p1.220054@news2.ulv.nextra.no...
> I've made a prog (my first) which has some textboxes/combos that
is used in
> the calculations.
> The program works fine if i fill out everything, but if i forget
to fill out
> f.ex one textbox, then i get this message:
>
> Cast from string "" to type 'Double' is not valid

Vis dog koden !


--
/\ preben nielsen
\/\ prel@post.tele.dk

---

Du kunne jo f.eks. lave noget exception handling... Jeg ved ikke om du
programmerer i vb6 eller vb.net, men i vb.net ville jeg nok gøre sådan her:

private sub calc()
Try
udregninger
catch ice as invalidCastException
messagebox.show("You must fill out all the fields", "Warning!")
End try
end sub

Prøv det....
"preben nielsen" <prel@post.tele.dk> skrev i en meddelelse
news:3d73a464$0$145$edfadb0f@dspool01.news.tele.dk...
>
> "Tor-Arne Jensen" <torarneg@stud.ntnu.no> skrev i en meddelelse
> news:lJHc9.13106$0p1.220054@news2.ulv.nextra.no...
> > I've made a prog (my first) which has some textboxes/combos that
> is used in
> > the calculations.
> > The program works fine if i fill out everything, but if i forget
> to fill out
> > f.ex one textbox, then i get this message:
> >
> > Cast from string "" to type 'Double' is not valid
>
> Vis dog koden !
>
>
> --
> /\ preben nielsen
> \/\ prel@post.tele.dk
>
>