Problem using form as criteria in query

[Guest]

I have a form with an input box that has a default value set. I then have a
query that is using this value as criteria (Forms!frmTest!txtValue). When
the query is ran the value is not being picked up in the query. Its showing
as empty. If I physically type in a value in the form it works. How do I
get a query to work with default values from a form field? I also tried
putting the Forms!frmTest!txtValue as a parameter in the query. Did not help.

Thanks in advance.

 

[Guest]

If it is a fixed default value, then try using the IIF

Where FieldName = IIF(Forms!frmTest!txtValue = "" Or Forms!frmTest!txtValue
is null,"Inser here the Default Value",Forms!frmTest!txtValue)