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02.05.2008 at 03:35AM PST, ID: 23137681
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Combobox DisplayMember & ValueMember Understanding
Tags: Vb.net, Visual Studio 2005
Hi Experts,

I'm not sure if I understand the meaning of displaymember and valuemember correctly on combobox's but in relation to my MS Access experience, I understand the first is what's displayed in the combobox and the second is what value is used when a selection is made?

I have a windows form that has a bound combobox on it and I have set the datasource to a seperate table which stores the combobox list. I then set the displaymember (and this a string (it's a name)) and the valuemember (which is a unique integer).

This shows the displaymember as required and I can select from the list - but when I attempt to move onto the next record in my dataset it will not. I assume it won't accept the string in the combobox - as it's bound to a field of integer type - and is attempting to store this integer not the valuemember string?

Not sure how well I've explained that!

Any assistance, as usual much appreciated.

Best regards,

Sam
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Question Stats
Zone: Programming
Question Asked By: SamB
Solution Provided By: jpaulino
Participating Experts: 2
Solution Grade: A
Views: 394
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02.05.2008 at 03:38AM PST, ID: 20822120

Rank: Sage

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02.05.2008 at 04:45AM PST, ID: 20822414

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02.05.2008 at 06:07AM PST, ID: 20822893

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02.05.2008 at 06:11AM PST, ID: 20822917

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02.05.2008 at 09:01AM PST, ID: 20824634

Rank: Genius

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02.05.2008 at 03:38AM PST, ID: 20822120

Rank: Sage

>> I attempt to move onto the next record in my dataset it will not
Have you tried to change the selectedindex ?

Can you show us what you got ?
Accepted Solution
 
02.05.2008 at 04:45AM PST, ID: 20822414
Hi jpaulino,

Here's my code:
     
Me.DmComboBox.DataSource = Me.MasterDataSet1.DMP
Me.DmComboBox.DisplayMember = "dmpsupplier"
Me.DmComboBox.ValueMember = "id"

Me.DmComboBox.SelectedIndex = 1

I've added the selectedindex and changed it from 0 to 1 but no luck - still populates the combobox with the string, but won't allow any changes. I've also noticed that I can scroll through records if I don't touch this combobox, but all the values are showing as the first in the list (which is not correct).

Many thanks,

Sam

 
02.05.2008 at 06:07AM PST, ID: 20822893

Rank: Sage

But you see the values ?
 
02.05.2008 at 06:11AM PST, ID: 20822917
Yes - I see the values (strings) but as soon as I attempt to select one the form 'locks up' because it seems not to like my selection.
 
02.05.2008 at 09:01AM PST, ID: 20824634

Rank: Genius

Is this linked to yet another datatable?  That is, are you using this combo to put a value in another record?  Is it a "look-up"?  If so, it sounds as though that other table is expecting one datatype and being offered a different datatype.

Do you have any code anything at all like this

Me.DmComboBox.Bindings.Add("SelectedValue",SomeTable,"SomeFieldName")

If so, can we please see it?

Roger
Assisted Solution
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628