Solved

VB.net Events and Databinding

Posted on 2009-07-06
6
200 Views
Last Modified: 2012-05-07
I've posted my code below.  I have 2 combo boxes (cbo1 and cbo2)

When the user selects a value from cbo1, and changes focus, I want to set the value of cbo2 based on the selected value of cbo1.  

The fetchList call works fine, it returns the selected list.

Here is the problem.  When I select an item from cbo1, and then cause it to lose focus, the below function is called, BUT cbo2 is blank.  If i select the same item again (from cbo1) and lose focus again, cbo2 is then filled properly.

Can anyone point out what I'm doing wrong?


Private Sub cbo1_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles cbo1.LostFocus
        If cbo1.SelectedValue Is Nothing Then Exit Sub
            cbo2.DisplayMember = "DisplayString"
            cbo2.ValueMember = "Value"
            cbo2.DataSource = myClass.fetchList(cbo1.SelectedValue)
  
    End Sub

Open in new window

0
Comment
Question by:BobBarker_99
6 Comments
 
LVL 41

Expert Comment

by:guru_sami
ID: 24789557
set breakpoint at line: If cbo1.SelectedValue Is Nothing Then Exit Sub
and see the value of cbo1.SelectedValue  when the first time it is not being populated...
Could be that value is being not set for some reason ...
0
 
LVL 70

Expert Comment

by:Éric Moreau
ID: 24790732
0
 
LVL 83

Expert Comment

by:CodeCruiser
ID: 24793769
I think using the SelectedIndexChanged event may help.
0
Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

 

Author Comment

by:BobBarker_99
ID: 24793795
I have tried setting a breakpoint.  The selected value is as expected, but the second combo box does not populate.
0
 
LVL 83

Accepted Solution

by:
CodeCruiser earned 500 total points
ID: 24793887
Are you sure the fetchlist does return results? Set a breakpoint in that function to see what it is returning.
0
 

Author Closing Comment

by:BobBarker_99
ID: 31600373
Found it.  It was returing results, but different results the first and second time through.  Tracked it down, the cbo1.selectedValue wasnt what I expected teh first time through.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Well, all of us have seen the multiple EXCEL.EXE's in task manager that won't die even if you call the .close, .dispose methods. Try this method to kill any excels in memory. You can copy the kill function to create a check function and replace the …
Parsing a CSV file is a task that we are confronted with regularly, and although there are a vast number of means to do this, as a newbie, the field can be confusing and the tools can seem complex. A simple solution to parsing a customized CSV fi…
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question