Evaluate before update

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:
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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"
   exit sub
end if

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Frank FreeseAuthor Commented:
thank you - - - perfect
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