Selecting item from combo box

yhgtbfk

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Not sure what to search for so I thought Id write a new post:

I have a combo box which selects 3 items-

Primary key, Surname, Firstname

After an item is selected, the fields are populated according to the item.

Since there will be many records, it would be nice if the user can begin typing the surname and have predictive text, so the three items should then be-

Surname, Firstname, Primary key

So my question is, how do I get at the primary key if it is not selected?

myText = dlookup("myValue", "myTable", "primarykey = '" & ???? & "'")

If this does not make sense, what I am trying to say is:

The surname is selected, but I want to do a calculation based on the primary key so I get all the data associated with that user. I cant use the surname because there are duplicates.

Thank you
 

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