Evaluate before update

Experts,
In my form frmDesignatedEmployee I have a combo box, data type number, named StoreID from my table tblStore.
I am needing to create new records in my table tblDesignatedEmployee. This table has a field data type number named StoreID. I would like to evaluate BeforeUpdate my combo box to check to make sure that StoreID in my tblDesignatedEmployee has not been already assigned the same StoreID from the Store table. Then inform the user that this store has a designated employee already.
Why? I use an Insert Into query because I need to write four records concurrently.
Frank FreeseAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Rey Obrero (Capricorn1)Commented:


place this codes before inserting the records
 
If dcount("*","tblDesignatedEmployee","[StoreID]= " & me.StoreID) >0 then
   msgbox "Store ID already exists"
 
   exit sub
end if

 
you can place the codes in the beforeupdate event of the combo box

If dcount("*","tblDesignatedEmployee","[StoreID]= " & me.StoreID) >0 then
   msgbox "Store ID already exists"
   cancel=true
   exit sub
end if
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Frank FreeseAuthor Commented:
thank you - - - perfect
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Access

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.