Solved How to SUM value in subform via VBA code?

[yunhsuan]

Hello~
I use SUM() to calculate value in subform on main Access Form by control data source (Below is "Test" file).
But the value would become unchangeable. So I want to calculate value by using VBA code.
I have tried to use DSum fn, but I failed. Maybe I used the wrong code.
Can any one tell me how to write the code?

Also, can SUM fn skip Null and properly calculate value?

 

[June7]

Aggregate functions ignore Null and only include records where field has data.

I hope you use better naming convention in real database. For starters, don't use spaces.

These work:
=[Table2]![Tax excluded]
=[Table2]![Taxes]
=[Table2]![Tax included]

 

[arnelgp]

Use query.

 

[yunhsuan]

Thanks for suggestions! The problem was resolved successfully.