ComboBox Question

**Imran Koradia** · Nov 21 '05, 01:49 AM

Re: ComboBox Question

You could use a hashtable to store the index-ID mappings. something like:

For Each oCompany as Company In Companies
oHash.Add(oComp any.CompanyID, cmbCompany.Item s.IndexOf(oComp any))
Next oCompany

When you need the index for a given CompanyID, you just do:

Dim index As Integer = CType(oHash.Ite m(CompanyID), Integer)

This would work fine for a fixed combobox where you're not going to be
adding-removing items at runtime. If you are going to be adding-removing
items, you'll need to update the hashtable to reflect these changes.
Also, for a combobox with not a lot of items (probably 10 to 15 items), it
wouldn't be too bad to loop through the combobox to retrieve the index since
populating and maintaining the hashtable does add some overhead anyway.

hope this helps..
Imran.

"Nikolay Petrov" <johntup2@mail. bg> wrote in message
news:uYFpGeblEH A.324@TK2MSFTNG P11.phx.gbl...[color=blue]
> I have a Combo box, binded to a dataset
> With cmbCompany
> .DataSource = dsSpecContact
> .DisplayMember = "Companies.Comp anyName"
> .ValueMember = "Companies.Comp anyID"
> End With
>
> What I want is to change the SelectedIndex of this Combo Box by using the
> ValueMember or DisplayMemver values. I mean the "Companies.Comp anyID" or
> "Companies.Comp anyName".
>
> Some how I have to iterate through all the item in Combo Box and find[/color]
which[color=blue]
> item has ValueMember = "Companies.Comp anyID" or DisplayMember =
> "Companies.Comp anyName" and select it.
>
> Does anyone know how to do that, couse I can't figure it out
>
>
>
> TIA
>
>[/color]

**Nikolay Petrov** · Nov 21 '05, 01:51 AM

Re: ComboBox Question

How to loop through the Combo Box items.
I know only the following method:
Dim itm as object
for each itm in ComboBox1.items
....
....
next

But this method does not provide me a way to access items properties,
becouse they are defined as Object

"Imran Koradia" <nospam@microso ft.com> wrote in message
news:%23scrUubl EHA.712@TK2MSFT NGP09.phx.gbl.. .[color=blue]
> You could use a hashtable to store the index-ID mappings. something like:
>
> For Each oCompany as Company In Companies
> oHash.Add(oComp any.CompanyID, cmbCompany.Item s.IndexOf(oComp any))
> Next oCompany
>
> When you need the index for a given CompanyID, you just do:
>
> Dim index As Integer = CType(oHash.Ite m(CompanyID), Integer)
>
> This would work fine for a fixed combobox where you're not going to be
> adding-removing items at runtime. If you are going to be adding-removing
> items, you'll need to update the hashtable to reflect these changes.
> Also, for a combobox with not a lot of items (probably 10 to 15 items), it
> wouldn't be too bad to loop through the combobox to retrieve the index[/color]
since[color=blue]
> populating and maintaining the hashtable does add some overhead anyway.
>
> hope this helps..
> Imran.
>
> "Nikolay Petrov" <johntup2@mail. bg> wrote in message
> news:uYFpGeblEH A.324@TK2MSFTNG P11.phx.gbl...[color=green]
> > I have a Combo box, binded to a dataset
> > With cmbCompany
> > .DataSource = dsSpecContact
> > .DisplayMember = "Companies.Comp anyName"
> > .ValueMember = "Companies.Comp anyID"
> > End With
> >
> > What I want is to change the SelectedIndex of this Combo Box by using[/color][/color]
the[color=blue][color=green]
> > ValueMember or DisplayMemver values. I mean the "Companies.Comp anyID"[/color][/color]
or[color=blue][color=green]
> > "Companies.Comp anyName".
> >
> > Some how I have to iterate through all the item in Combo Box and find[/color]
> which[color=green]
> > item has ValueMember = "Companies.Comp anyID" or DisplayMember =
> > "Companies.Comp anyName" and select it.
> >
> > Does anyone know how to do that, couse I can't figure it out
> >
> >
> >
> > TIA
> >
> >[/color]
>
>[/color]

**Nikolay Petrov** · Nov 21 '05, 01:51 AM

Re: ComboBox Question

Also I don't understand

For Each oCompany as Company In Companies
oHash.Add(oComp any.CompanyID, cmbCompany.Item s.IndexOf(oComp any))
Next oCompany

Could you please declare items oCompany, Company, Companies

"Imran Koradia" <nospam@microso ft.com> wrote in message
news:%23scrUubl EHA.712@TK2MSFT NGP09.phx.gbl.. .[color=blue]
> You could use a hashtable to store the index-ID mappings. something like:
>
> For Each oCompany as Company In Companies
> oHash.Add(oComp any.CompanyID, cmbCompany.Item s.IndexOf(oComp any))
> Next oCompany
>
> When you need the index for a given CompanyID, you just do:
>
> Dim index As Integer = CType(oHash.Ite m(CompanyID), Integer)
>
> This would work fine for a fixed combobox where you're not going to be
> adding-removing items at runtime. If you are going to be adding-removing
> items, you'll need to update the hashtable to reflect these changes.
> Also, for a combobox with not a lot of items (probably 10 to 15 items), it
> wouldn't be too bad to loop through the combobox to retrieve the index[/color]
since[color=blue]
> populating and maintaining the hashtable does add some overhead anyway.
>
> hope this helps..
> Imran.
>
> "Nikolay Petrov" <johntup2@mail. bg> wrote in message
> news:uYFpGeblEH A.324@TK2MSFTNG P11.phx.gbl...[color=green]
> > I have a Combo box, binded to a dataset
> > With cmbCompany
> > .DataSource = dsSpecContact
> > .DisplayMember = "Companies.Comp anyName"
> > .ValueMember = "Companies.Comp anyID"
> > End With
> >
> > What I want is to change the SelectedIndex of this Combo Box by using[/color][/color]
the[color=blue][color=green]
> > ValueMember or DisplayMemver values. I mean the "Companies.Comp anyID"[/color][/color]
or[color=blue][color=green]
> > "Companies.Comp anyName".
> >
> > Some how I have to iterate through all the item in Combo Box and find[/color]
> which[color=green]
> > item has ValueMember = "Companies.Comp anyID" or DisplayMember =
> > "Companies.Comp anyName" and select it.
> >
> > Does anyone know how to do that, couse I can't figure it out
> >
> >
> >
> > TIA
> >
> >[/color]
>
>[/color]

ComboBox Question

ComboBox Question

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