Question

ComboBoxes

Asked by: thunderchicken

Is there a way to set the value of an item within a combo box without using DataBind() ?

We use objects to get to data, where I really can't do anything about it this way.

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Asked On
2003-09-19 at 10:42:37ID20743660
Topic

.NET

Participating Experts
2
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Comments
6

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Answers

 

by: seeflatPosted on 2003-09-19 at 11:00:41ID: 9395178

You can explicitly add ListItem's to the Items collection of the combobox.

ListItem li = new ListItem();
li.Text = "ItemText";
li.Value = "ItemValue";

myCombo.Items.Add(li);

HTH

 

by: thunderchickenPosted on 2003-09-19 at 11:03:02ID: 9395200

It shows in the select item as

{ListViewItem} : Value

 

by: seeflatPosted on 2003-09-19 at 11:44:35ID: 9395614

Can you post your code please?

Thanks

 

by: morphinexPosted on 2003-09-19 at 11:46:13ID: 9395628

Your class object must have two different fields.  One for the actual text, and one for the value item.  Here's an example from MSDN Library

First, we define the class object that we'd use in the combobox

--------
Public Class USState

    Private myShortName As String
    Private myLongName As String

    Public Sub New(ByVal strlongName As String, ByVal strShortName As String)
        MyBase.New()
        Me.myShortName = strShortName
        Me.myLongName = strlongName
    End Sub

    Public ReadOnly Property ShortName() As String
        Get
            Return myShortName
        End Get
    End Property

    Public ReadOnly Property LongName() As String
        Get
            Return myLongName
        End Get
    End Property

    Public Overrides Function ToString() As String
        Return Me.ShortName & " - " & Me.LongName
    End Function
End Class

--------

Then, we will populate the array collection

        Dim USStates As New ArrayList
        USStates.Add(New USState("Washington", "WA"))
        USStates.Add(New USState("West Virginia", "WV"))
        USStates.Add(New USState("Wisconsin", "WI"))
        USStates.Add(New USState("Wyoming", "WY"))

Then, we will set up the combo box

        Me.ComboBox1.DataSource = USStates
        ComboBox1.DisplayMember = "LongName"
        ComboBox1.ValueMember = "ShortName"

--- to test this, we'd play with selectedIndexChanged thing

    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        If Me.ComboBox1.SelectedIndex > -1 Then
            Me.Label4.Text = ""
            Me.Label2.Text = ""
            Me.Label1.Text = ""
            Me.Label3.Text = ""

            Me.Label1.Text = CType(Me.ComboBox1.SelectedItem, USState).ShortName
            Me.Label2.Text = Me.ComboBox1.SelectedValue.ToString
            Me.Label3.Text = Me.ComboBox1.SelectedItem.ToString
            Me.Label4.Text = Me.ComboBox1.Text
        End If
    End Sub


---

Hope this helps

 

by: thunderchickenPosted on 2003-09-19 at 11:48:14ID: 9395647

Using an Array is what I'm currently doing, which works...

Here's the li code:

 For Each objProv In objProvSet
            Dim li as new ListViewItem
            li.Text = objProv.Description
            li.Tag = objProv.ID
            cboDesc.Items.Add(li)
            li = Nothing
       Next

 

by: thunderchickenPosted on 2003-09-25 at 05:55:39ID: 9427962

I figured it out by creating a custom dataset, then binding it.

Thanks, request for delete.

20120131-EE-VQP-002

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