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Ms Access - DLookup into text field

I am having problems tryiing to populate my text box with a field from a query. I have tried everything. Basically I want to be able to put a value in my text box, on my form, using the DLookup function. I am looking up values from my query and get a data type mismatch error. My query is;

SELECT tbl_Historical_SPN_Trades.spn_name, tbl_Exclusion_Type.Exclusion, tbl_Historical_SPN_Trades.Date_Added, tbl_Historical_SPN_Trades.spn_id AS SPN
FROM tbl_Historical_SPN_Trades INNER JOIN tbl_Exclusion_Type ON tbl_Historical_SPN_Trades.[Exclusion Type] = tbl_Exclusion_Type.Exclusion_ID;

And My DLookup is

strSPNValue = txtSPN.Value  (Which will equal something like 0020397)
txtExclusion.Text = DLookup("[Exclusion]", "Sel_Historical_SPN_Lookup", "SPN = " & strSPNValue)

Now SPN is a text field in my table, as is Exlusion. I can not see why the error is occuring?
1 Solution
Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Text values must be enclosed in single or double quotes. I use single quotes:

txtExclusion = DLookup("[Exclusion]", "Sel_Historical_SPN_Lookup", "SPN ='" & strSPNValue & "'")

Also, don't set the .Text value ... in order to do that, your control must have the focus. Access isn't like other programming environments (like VB) ...
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