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VB.NET Discussion Thread
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Dec 13th, 2005

Combo box selection problem

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Hi,

I have a problem when selecting values from some combo boxes.

I have a form with two combo boxes next to each other, they both have the same data source, which is an array. I need to be able to select different values in each combo box.

My problem is that when the user selects a value from either combo box, it sets the other combo box to the same value. So the values in the combo boxes are always the same as each other, I can't make one different from the other unless I type in one of them.

I don't have any events coded for these combo boxes, so it seems to be something with .NET.

I've tried moving the combo boxes away from each other, putting then on different panels and group boxes and nothing has worked.

Any help would be appreciated

Thanks

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hippychic43

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Dec 13th, 2005

Re: Combo box selection problem

The only way I've found around this problem, is to create two arrays, one for each combo box, that store the same stuff. This is what my code that doesn't work looks like:

Quote ...

Dim dose() As String = {"1/2", "1", "1 & 1/2", "2", "2 & 1/2", "3", "4", "5", "6", "1/2 ml", "1 & 1/2 ml", "2 ml", "2 & 1/2 ml", "3 ml", "4 ml", "5 ml", "10 ml", "15 ml"}
cboMedDose.DataSource = dose
cboPatDose.DataSource = dose

This is the code that works where I create another array:

Quote ...

Dim dose() As String = {"1/2", "1", "1 & 1/2", "2", "2 & 1/2", "3", "4", "5", "6", "1/2 ml", "1 & 1/2 ml", "2 ml", "2 & 1/2 ml", "3 ml", "4 ml", "5 ml", "10 ml", "15 ml"}
cboMedDose.DataSource = dose
Dim somethingElse() As String = {"1/2", "1", "1 & 1/2", "2", "2 & 1/2", "3", "4", "5", "6", "1/2 ml", "1 & 1/2 ml", "2 ml", "2 & 1/2 ml", "3 ml", "4 ml", "5 ml", "10 ml", "15 ml"}
cboPatDose.DataSource = somethingElse

I tried this as well, and it didn't work:

Quote ...

Dim dose() As String = {"1/2", "1", "1 & 1/2", "2", "2 & 1/2", "3", "4", "5", "6", "1/2 ml", "1 & 1/2 ml", "2 ml", "2 & 1/2 ml", "3 ml", "4 ml", "5 ml", "10 ml", "15 ml"}
cboMedDose.DataSource = dose
Dim somethingElse() As String = dose
cboPatDose.DataSource = somethingElse

If anyone could think of a better solution I'd really appreciate it.

Thanks
Cristy

hippychic43

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Jun 9th, 2006

Re: Combo box selection problem

Dim SomethingElse() as String = dose

doesn't work because both variables still reference the same array instance. Use the array's Clone method to create the second copy for you.

Dim dose() As String = {"1/2", "1", "1 & 1/2", "2", "2 & 1/2", "3", "4", "5", "6", "1/2 ml", "1 & 1/2 ml", "2 ml", "2 & 1/2 ml", "3 ml", "4 ml", "5 ml", "10 ml", "15 ml"}
Dim SomethingElse() as String = dose.Clone

cboMedDose.DataSource = dose
cboPatDose.DataSource = SomethingElse

Quote originally posted by hippychic43 ...

The only way I've found around this problem, is to create two arrays, one for each combo box, that store the same stuff. This is what my code that doesn't work looks like:

This is the code that works where I create another array:

I tried this as well, and it didn't work:

If anyone could think of a better solution I'd really appreciate it.

Thanks
Cristy

JCinSB

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Jun 10th, 2006

Re: Combo box selection problem

I always feel shorter is better so just add .clone onto your dose

VB.NET Syntax (Toggle Plain Text)
Dim dose() As String = {"1/2", "1", "1 & 1/2", "2", "2 & 1/2", "3", "4", "5", "6", "1/2 ml", "1 & 1/2 ml", "2 ml", "2 & 1/2 ml", "3 ml", "4 ml", "5 ml", "10 ml", "15 ml"}
cboMedDose.DataSource = dose.Clone
cboPatDose.DataSource = dose.Clone
Dim dose() As String = {"1/2", "1", "1 & 1/2", "2", "2 & 1/2", "3", "4", "5", "6", "1/2 ml", "1 & 1/2 ml", "2 ml", "2 & 1/2 ml", "3 ml", "4 ml", "5 ml", "10 ml", "15 ml"}
cboMedDose.DataSource = dose.Clone
cboPatDose.DataSource = dose.Clone

waynespangler

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Oct 31st, 2006

Re: Combo box selection problem

Click to Expand / Collapse Quote originally posted by waynespangler ...

I always feel shorter is better so just add .clone onto your dose
VB.NET Syntax (Toggle Plain Text)
Dim dose() As String = {"1/2", "1", "1 & 1/2", "2", "2 & 1/2", "3", "4", "5", "6", "1/2 ml", "1 & 1/2 ml", "2 ml", "2 & 1/2 ml", "3 ml", "4 ml", "5 ml", "10 ml", "15 ml"}
cboMedDose.DataSource = dose.Clone
cboPatDose.DataSource = dose.Clone
Dim dose() As String = {"1/2", "1", "1 & 1/2", "2", "2 & 1/2", "3", "4", "5", "6", "1/2 ml", "1 & 1/2 ml", "2 ml", "2 & 1/2 ml", "3 ml", "4 ml", "5 ml", "10 ml", "15 ml"} cboMedDose.DataSource = dose.Clone cboPatDose.DataSource = dose.Clone

Try disabling databinding on the dose object
eg
Me.BindingContext.Item(dose).SuspendBinding()

where Me is the form. This lets you use the one source for your combo box. Ofcourse you will need to manually make any changes in response the SelectedValue/ Index chnage events on the combo boxes

outside404

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Oct 31st, 2006

Re: Combo box selection problem

never mind.

Last edited by waynespangler; Oct 31st, 2006 at 10:41 pm.

waynespangler

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