Binding Sources Navigation

Posted on 2008-06-19
Medium Priority
Last Modified: 2010-04-23
I have a binding source for an Address combobox in a project

The binding source has three columns suburbid, suburbname, postcodeid.  suburbid = value, suburbname = displaytext

I need to extract the postcodeid when a user selects a suburb. How do I do this.

Question by:PhillO
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LVL 18

Expert Comment

ID: 21832116

        ComboBox1.ValueMember = "postcodeid"
        ComboBox1.DisplayMember = "suburbname"
        ComboBox1.DataSource = ds.Tables("Address")


      With Me.ComboBox1
            .ValueMember = "postcodeid"
            .DisplayMember = "suburbname"
            .DataSource = ds.Tables("Address")
            .DataBindings.Add("SelectedValue", ds.Tables("Address"), "postcodeid")
        End With

    Private Sub ComboBox1_SelectedValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedValueChanged

        Dim i As Integer = ComboBox1.SelectedValue


         'Or you could get the specific row from the table you bound to the cbo
        If ComboBox1.SelectedIndex <> -1 Then
            Dim dr As DataRow = ds.Tables("Address").Rows(ComboBox1.SelectedIndex)
    End Sub

Hope this helps


Author Comment

ID: 21832539
Thanks for the reply

But how do I retrieve the actual postcodeid from the selected row
LVL 18

Expert Comment

ID: 21832724
this you do in the ComboBox1_SelectedValueChanged event

    Private Sub ComboBox1_SelectedValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedValueChanged

        Dim i As Integer = ComboBox1.SelectedValue


the value(ComboBox1.SelectedValue) is the id value that you specified "ComboBox1.ValueMember = "postcodeid"!

That is the actual postcodeid from the selected  "suburbname"

suburbname          ID

Jane                       7    
Hans                      19                   MessageBox.Show(ComboBox1.SelectedValue) is = 19    
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Author Comment

ID: 21832901
Perhaps I'm going *way* down the wrong track. Please bear with me as I am new to vb.net.

Basically I'm trying to convert an ms access database to vb.net. In Access I can assign a combobox with three columns and just select the value of the third column. I don't know what the equivalent is here

The datasource for the combobox has three columns SuburbID, Suburb, & postcodeID, The combobox value is set to suburbID which is what I want but I am using the combobox to proccess two values. The SuburbID (which I know how to get) and the postcodeID ( what I don't know how to get).

At the moment I am finding the whole dataset/datatables/binding/mappings/etc a tad confusing.
LVL 18

Accepted Solution

vbturbo earned 2000 total points
ID: 21833206
try check this upload ive made for you



Author Comment

ID: 21835738
Absolutely Brilliant!! Thanks

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