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Add Sum to an item (see file)

Hello guys


In a formular, frmCourseMain, I just want to add a textbox (SUM in red in the file) which contains the sum of the fees of the student registered for the course chosen.
I made a simple request  SumFeesOfCourse, and I dont know how to link this with the textbox in order to screen a correct result.
I think my understanding of how to link is not proper...

Thanks in advance for explanation!

example.mdb
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Noero
Asked:
Noero
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1 Solution
 
mbizupCommented:
You can't "link" directly to your query in the control source of your textbox.  You need to lookup the value.

This will give you the sum for the CourseID of the current record on your main form:

=DLookUp("SommeDeFees","SumFeesForCourse","CourseID = " & [CourseID])
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mbizupCommented:
There's good relevant information and explanations by Jim Dettman in his article on DLookup and the Domain Functions here:
http://www.experts-exchange.com/Microsoft/Development/MS_Access/A_12-Dlookup-and-the-Domain-Functions.html

(if the article is helpful to you, vote 'yes' on it)
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NoeroAuthor Commented:
Quick, Clear, Efficient: Thank you!
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