hey sorex,
thx for the fast feedback... and u will guess i found it... there wasn't that i give him the 0 at initializing but more that the second varible, which is double too, don't have any input so i go with "" into the second double... aaand... here we got the exception trouble... ;-) thanks a lot...
furthermore the update event... how can i make update event to the label txt... i thought that this is allready done when i give him blabla.Text=blablavariable...
cheers
bobbi