constraint problem

[Agnes]

I had declare the keyconstraint.
Dim con_id_rv As ForeignKeyConst raint
con_id_rv = New ForeignKeyConst raint("fk_id",
dtInv.Columns(" invno"), dtRv.Columns("i nvno"))

However, I got one error
Object reference not set to an instance of an object.

Please help.
Thanks a lot

[Marina Levit [MVP]]

Re: constraint problem

Why don't you put a breakpoint where you are creating the constraint, and
make sure all these objects aren't null. This would be the easiest and
fastest way to fix the problem.

"Agnes" <agnes@dynamict ech.com.hkwrote in message
news:%23X8kAZ7v GHA.4436@TK2MSF TNGP06.phx.gbl. ..

>I had declare the keyconstraint.
Dim con_id_rv As ForeignKeyConst raint
con_id_rv = New ForeignKeyConst raint("fk_id",
dtInv.Columns(" invno"), dtRv.Columns("i nvno"))
>
However, I got one error
Object reference not set to an instance of an object.
>
Please help.
Thanks a lot
>
>