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data linked forms

Posted on 2001-06-13
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Last Modified: 2010-05-02
Hi.  I'm trying to write a database program in VB.  However, there is one form which cannot hold all the information on it at the same time, so I created a second form to hold the rest of the info.  The problem is that on the first form, there is a data control which is used to scroll through the different records.  How do I make it so that when I scroll, the information on the second form also scrolls with it (i.e. if i bring up the second form, the info on the second form will match the record displaying on the first)?

I tried doing the following, but it's giving me an error, "Invalid use of null".  Can someone help me fix this please?

txtPayment.DataField = txtEnterInvoices.dbFairbanx.Recordset.Fields("PYMNTRCVD")

txtPaymentDate.DataField = frmEnterInvoices.dbFairbanx.Recordset.Fields("PYMNTDATE")

-Vyl
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Question by:Vyldryn
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Expert Comment

by:agriggs
ID: 6186271
Why not use two tabs on the same form, like most programs do?  Set a reference to Microsoft Windows Common Controls, then drop a tabstrip onto your form, then move your controls from one form onto the top tab, and move your controls from the other form onto another tab.

I haven't solved the problem you asked about, but I never use bound controls.

Good luck.
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LVL 1

Expert Comment

by:manno
ID: 6186340
You can put a second Data Control on form2, and...

Set form2.dCtrl = form1.dCtrl

Also, you get Invalid Use of Null because you're trying to assign the default value of the Field object to the Datafield of the textbox. The default value is Value (ie what's in the field).

txtPaymentDate.DataField = "PYMNTDATE"


Incidentally, you can get round Invalid Use of Null when trying to put a Null field into something by adding an empty string:

(field) = (nullvalue) & ""
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Author Comment

by:Vyldryn
ID: 6186357
I will try this...but I can't seem to find the Common Controls reference in my reference list.  What is it called in the references list?

- Vyl
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Accepted Solution

by:
nerfgunz earned 200 total points
ID: 6192556
Hi Vyldrn,

What type of datacontrols are you using?

You could setup a search code where a datacontrol on the 2nd form queries data based on an identification from the 1st form.

Try something like this:
db2nd.RecordSource = "select * from invoices where myField = '" & frm1stForm.txtDealNumber.Text & "';"

db2nd.Refresh

Good luck.
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Expert Comment

by:nerfgunz
ID: 6192566
You're identification could be anything unique such as what you are using as your primary key in the table.
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Author Comment

by:Vyldryn
ID: 6192912
wow, great help, thanks!  it does exactly what I needed it to do.
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Expert Comment

by:manno
ID: 6194363
The accepted answer is not the most efficient.
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