combobox mdi load selectedIndex

[Kalvin]

I have seen this question raised, but I cannot find an answer.

I have an MDI app, when I load an child form with a combobox being
bound in the load event, it won't allow me to set selectedindex = -1.
If it isn't an mdi child, then there isn't a problem. I have tried
setting it to -1 two times. I have tried setting the selecteditem
property to -1 and also to nothing. None of it seems to make a
difference.

Any help will be appreciated.
Kalvin

[Bernie Yaeger]

Re: combobox mdi load selectedIndex

Hi Kalvin,

Can we see some code? I have literally hundreds of such child forms and
selectedindex = -1 (twice) works fine.

Bernie Yaeger

"Kalvin" <ktuel@streck.c om> wrote in message
news:1108055538 .440071.157720@ c13g2000cwb.goo glegroups.com.. .[color=blue]
>I have seen this question raised, but I cannot find an answer.
>
> I have an MDI app, when I load an child form with a combobox being
> bound in the load event, it won't allow me to set selectedindex = -1.
> If it isn't an mdi child, then there isn't a problem. I have tried
> setting it to -1 two times. I have tried setting the selecteditem
> property to -1 and also to nothing. None of it seems to make a
> difference.
>
> Any help will be appreciated.
> Kalvin
>[/color]

[Kalvin]

Re: combobox mdi load selectedIndex

When the form is not an MDI child form, this works fine and there is
not a value in the combobox. When the form is an MDI child form, and
this is in the Load event, then there will be a value in the combobox.

Thank you for looking at this.

/****** CODE STARTS HERE *******/
Private Sub frmTest_Load(By Val sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
Dim LotServer As New LotServer
Dim Lots As LotCollection

Try
Dim conn As SqlConnection = New SqlConnection({ your
connection})
conn.Open()

Dim dt As New DataTable
Dim cmd As SqlCommand = New SqlCommand
cmd.CommandText = {your query}
cmd.CommandType = CommandType.Tex t
cmd.Connection = conn

Dim da As SqlDataAdapter = New SqlDataAdapter( cmd)

da.Fill(dt)

box1.DataSource = dt
box1.ValueMembe r = "ID"
box1.DisplayMem ber = "Name"
box1.SelectedIn dex = -1
box1.SelectedIn dex = -1

conn.Close()

Catch exc As Exception
MessageBox.Show (exc.Message.To String)
End Try

End Sub

[Bernie Yaeger]

Re: combobox mdi load selectedIndex

Hi Kalvin,

OK, there are two 'answers'. When I followed your code, I experienced the
same condition you describe. However, when I loaded the data through a
dataset created by the vs .net wizard, it worked fine with selectedindex
= -1 twice. Also, when I load a combobox in additem mode, using a datatable
as you created, it was also fine.

HTH,

Bernie Yaeger

"Kalvin" <ktuel@streck.c om> wrote in message
news:1108134279 .131457.13950@z 14g2000cwz.goog legroups.com...[color=blue]
> When the form is not an MDI child form, this works fine and there is
> not a value in the combobox. When the form is an MDI child form, and
> this is in the Load event, then there will be a value in the combobox.
>
> Thank you for looking at this.
>
> /****** CODE STARTS HERE *******/
> Private Sub frmTest_Load(By Val sender As System.Object, ByVal e As
> System.EventArg s) Handles MyBase.Load
> Dim LotServer As New LotServer
> Dim Lots As LotCollection
>
> Try
> Dim conn As SqlConnection = New SqlConnection({ your
> connection})
> conn.Open()
>
> Dim dt As New DataTable
> Dim cmd As SqlCommand = New SqlCommand
> cmd.CommandText = {your query}
> cmd.CommandType = CommandType.Tex t
> cmd.Connection = conn
>
> Dim da As SqlDataAdapter = New SqlDataAdapter( cmd)
>
> da.Fill(dt)
>
> box1.DataSource = dt
> box1.ValueMembe r = "ID"
> box1.DisplayMem ber = "Name"
> box1.SelectedIn dex = -1
> box1.SelectedIn dex = -1
>
> conn.Close()
>
> Catch exc As Exception
> MessageBox.Show (exc.Message.To String)
> End Try
>
> End Sub
>[/color]

[Kalvin]

Re: combobox mdi load selectedIndex



That makes sense. I need to be able to bind it to a user defined
collection. I have six combo boxes. The first one loads when the form
opens, and then the others load depending on the user choice in the
first box. What I did was is just manually load the box. Then it isn't
bound and doesn't automatically pick the first item. I would rather be
able to bind it like the others though.

Thank you for your help and input, I really appreciate it. Sometimes
it's nice just to know I'm not the only one it doesn't work right for.

/**** CODE STARTS HERE ****/
Friend Function LoadCategories( ByRef DropDown As ComboBox) As
CategoryCollect ion

'Written(By) : KTuel
'Parameters: DropwDown - A combobox to be filled with the
categories
'
'Task: Load all product categories
'
'Revision(Histo ry)
'02/09/2005 - Created kTuel

Dim CategoryServer As New CategoryServer
Dim Categories As CategoryCollect ion

Categories = CategoryServer. LoadAllCategori es()

'.NET has a bug in MDI applications that when a combo box is
bound to a source and
'the combobox is populated in the load event of a child form,
you can't set the
'selectedindex to -1. Here we are populating the combobox
without binding it
Dim Category As Category


If Categories.Coun t > 0 Then
DropDown.Suspen dLayout()

For Each Category In DirectCast(Cate gories,
IDictionary).Va lues()
DropDown.Items. Add(Category)
Next Category
DropDown.Displa yMember = "Name"
DropDown.ValueM ember = "ID"

DropDown.Select edIndex = -1
DropDown.Select edIndex = -1

DropDown.Resume Layout()

End If

Return Categories

End Function

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