Combobox woes

[Ian Lent]

Would some kind sould please post sample code on how to load a combobox with
a string and an associated primary key (integer). I've been trying this for
days and haven't gotten anywhere. Any help would be much appreciated.

[Cesar]

"Ian Lent" <ilent00@hotmail.com> wrote:
>
>Would some kind sould please post sample code on how to load a combobox
with
>a string and an associated primary key (integer). I've been trying this
for
>days and haven't gotten anywhere. Any help would be much appreciated.

Try this snippet:
for (int i = 0; i < 10; i++)
{
comboBox1.Items.Add("Item" + i);
}

[Taiwo]

Here is an example:

The following class is a generic class that allows you to create an object
with a key and value pair:

Public Class ListData
Private m_value As Object
Private m_displayText As String

Public Property DisplayText() As String
Get
Return m_displayText
End Get
Set(ByVal Value As String)
m_displayText = Value
End Set
End Property

Public Property Value() As Object
Get
Return m_value
End Get
Set(ByVal Value As Object)
m_value = Value
End Set
End Property

Sub New(ByVal _displayText As String, ByVal _value As Object)
m_displayText = _displayText
m_value = _value
End Sub

End Class

You can then add instances of this class to your combo box. Assuming you
wanted to add US States and their state abbreviation as the key, you'd do
the following:

'-- Add states to array list
Dim listDataArr As ArrayList = New ArrayList(50)
listDataArr.Add(New ListData("Washington", "WA"))
listDataArr.Add(New ListData("California", "IL"))
...

'-- set up state combo box list items
With cboState
.Items.Clear()
.DataSource = listDataArr '-- list of State key-value pair objects
.DisplayMember = "DisplayText" '-- display the "DisplayText" property
of the ListData class
.ValueMember = "Value" '-- this is the value returned for the
SelectedValue property of the combo box.
End With

Since ListData's Value property is an object type, I noticed that the combo
box list works when I specify the actual type when creating ListData
instances. For example:

'-- Creating a boolean value combo list
listDataArr.Add(New ListData("No", System.Boolean.Parse("False")))
listDataArr.Add(New ListData("Yes", System.Boolean.Parse("True")))


'-- Creating a numeric value combo list
listDataArr.Add(New ListData("Female", System.Int16.Parse("0")))
listDataArr.Add(New ListData("Male", System.Int16.Parse("1")))

You can avoid having to do this by making your ListData's Value property be
a specific type.

---
This Posting is provided "AS IS" with no warranties, and confers no rights.
You assume all risk for your use. © 2002 Microsoft Corporation.
All rights reserved.

Taiwo Ayedun


"Cesar" <cesargmercado@msn.com> wrote in message
news:3c42cd43$1@147.208.176.211...
>
> "Ian Lent" <ilent00@hotmail.com> wrote:
> >
> >Would some kind sould please post sample code on how to load a combobox
> with
> >a string and an associated primary key (integer). I've been trying this
> for
> >days and haven't gotten anywhere. Any help would be much appreciated.
>
> Try this snippet:
> for (int i = 0; i < 10; i++)
> {
> comboBox1.Items.Add("Item" + i);
> }
>

[Taiwo]

I meant listDataArr.Add(New ListData("California", "CA")) rather than
listDataArr.Add(New ListData("California", "IL"))

---
Taiwo

"Taiwo" <taiwo_a@hotmail.com> wrote in message
news:3c42f610@147.208.176.211...
>
> Here is an example:
>
> The following class is a generic class that allows you to create an object
> with a key and value pair:
>
> Public Class ListData
> Private m_value As Object
> Private m_displayText As String
>
> Public Property DisplayText() As String
> Get
> Return m_displayText
> End Get
> Set(ByVal Value As String)
> m_displayText = Value
> End Set
> End Property
>
> Public Property Value() As Object
> Get
> Return m_value
> End Get
> Set(ByVal Value As Object)
> m_value = Value
> End Set
> End Property
>
> Sub New(ByVal _displayText As String, ByVal _value As Object)
> m_displayText = _displayText
> m_value = _value
> End Sub
>
> End Class
>
> You can then add instances of this class to your combo box. Assuming you
> wanted to add US States and their state abbreviation as the key, you'd do
> the following:
>
> '-- Add states to array list
> Dim listDataArr As ArrayList = New ArrayList(50)
> listDataArr.Add(New ListData("Washington", "WA"))
> listDataArr.Add(New ListData("California", "IL"))
> ...
>
> '-- set up state combo box list items
> With cboState
> .Items.Clear()
> .DataSource = listDataArr '-- list of State key-value pair objects
> .DisplayMember = "DisplayText" '-- display the "DisplayText"
property
> of the ListData class
> .ValueMember = "Value" '-- this is the value returned for the
> SelectedValue property of the combo box.
> End With
>
> Since ListData's Value property is an object type, I noticed that the
combo
> box list works when I specify the actual type when creating ListData
> instances. For example:
>
> '-- Creating a boolean value combo list
> listDataArr.Add(New ListData("No", System.Boolean.Parse("False")))
> listDataArr.Add(New ListData("Yes", System.Boolean.Parse("True")))
>
>
> '-- Creating a numeric value combo list
> listDataArr.Add(New ListData("Female", System.Int16.Parse("0")))
> listDataArr.Add(New ListData("Male", System.Int16.Parse("1")))
>
> You can avoid having to do this by making your ListData's Value property
be
> a specific type.
>
> ---
> This Posting is provided "AS IS" with no warranties, and confers no
rights.
> You assume all risk for your use. © 2002 Microsoft Corporation.
> All rights reserved.
>
> Taiwo Ayedun
>
>
> "Cesar" <cesargmercado@msn.com> wrote in message
> news:3c42cd43$1@147.208.176.211...
> >
> > "Ian Lent" <ilent00@hotmail.com> wrote:
> > >
> > >Would some kind sould please post sample code on how to load a combobox
> > with
> > >a string and an associated primary key (integer). I've been trying this
> > for
> > >days and haven't gotten anywhere. Any help would be much appreciated.
> >
> > Try this snippet:
> > for (int i = 0; i < 10; i++)
> > {
> > comboBox1.Items.Add("Item" + i);
> > }
> >
>
>

[Phil Weber]

Ian: Please do not post the same message to multiple groups. The
vb.dotnet.technical group is the best place for VB.NET technical questions;
you have received an answer to your question there.

All: Please do not reply to technical questions in this group. If you don't
reply, it's simple for me to move the question to the .technical group, but
it becomes much more difficult to do so when a thread contains several
messages. Thanks!
---
Phil Weber
DevX Newsgroup Admin