vb.net - Adding Item To Combo box collection

Posted on 2007-04-06
Medium Priority
Last Modified: 2008-02-01
I'm trying to add an item  ("<Select Item"> ) to a combo box in the load_gnder sub below.

I've tried "'Me.cbogender.Items.Insert(0, "<Select One>")"  which runs but wont display - and severl other ways to add the item but I cant get it to display in the combo box.

    Private Sub load_gender()
        Dim Dsgender As New DataSet
        Dim Sqlgender As String = ("select Description,indx from gender")
        Dsgender = get_data(Sqlgender)
        Dim dvgen As DataView = Dsgender.Tables(0).DefaultView
        Me.cbogender.DataSource = dvgen
        Me.cbogender.DisplayMember = ("Description")
        Me.cbogender.ValueMember = ("indx")
    End Sub

    Public Function get_data(ByVal Sqlin As String) As DataSet
        Dim Sqldata As String = Sqlin
        Dim conn As New SqlCeConnection(connstr)
        Dim DA1 As SqlCeDataAdapter = New SqlCeDataAdapter(Sqldata, conn)
        Dim ds4 = New DataSet
        DA1.Fill(ds4, "Table1")
        Return ds4
    End Function

Question by:gosonic
LVL 21

Expert Comment

ID: 18864052
You can't add items in that fashion to a databound control.  You need to "manually" populate the control and then include your extra item.
LVL 34

Accepted Solution

Sancler earned 1000 total points
ID: 18867941
You could add it to the datatable itself.  Something like - in the load_gender sub

    Dim dr As DataRow = Dsgender.Tables(0).NewRow
    dr("Description") = "<Select One>"
    dr("indx") = 0

But (a) you'd then need to add a Sort to your DataView otherwise it would be the last item in the combo, when I imagine you want it to be the first and (b) it would be a New record (and so added to the database) if you did any .Update on that table.  Or why not put it in your database table?  That would deal with the issue once and for all ;-).

I assume you will have some code for checking whether a user has left it blank in any new record in which it is used, or changed to it in any existing record which s/he is editing.


Author Comment

ID: 18876388

I really dont want to ad it to the DB table. You solution should work.  

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