i used the tableadapter wizard to gen the form.
for table a, and table b. of which a and b have relationship
now in form a, i try to make a manually lookup button that seeks value from
b and fill it in into the form a (table a)'s textbox, if user dodn't lookup
value, then it will set the text box to "",
but problems comes up, while it save, it said it had voliate the
constraints,
i know there had some problems on the insertion statments for that table
adapters? i.e. insert "" into a, insert NULL into a, which i want the one
behind, and the genernated code seems used the first one.
how can modifiy this ?
thx