ComboBox and updating data

[Mike Hildner]

I have a ComboBox that is data bound to a particular Dataset's table and column. When the DropDownStyle is DropDownList, a user's changes to the field are not recognized.

Changing the DropDownStyle to DropDown - things work just fine - either by selecting from the list or manually typing.

The latter is not an option, as I need to restrict the possible values. What am I missing here? Any ideas are appreciated.

Mike

[Pirate]

I had quite similar problem with DropDownList . I was trying to get the selected item by the user like this :
MsgBox(ComboBox4.SelectedItem()) and always throw an exception but when I changed the dropping style to ropDown it works . at the end I used this :
MsgBox(ComboBox4.Text) along with DropDownList property and worked fine . I dunno if this would give you any clue or not !

[Mike Hildner]

Well, it helped in that I know I'm not doing something really stupid, seems like there's a problem when setting the DropDownStyle to DropDownList.

Got around the problem by manually (through code, that is) updating the dataset's table/row/column with the Text property of the ComboBox.

Seems to me this is not intended behavior, which leads me to a (newbie) question: Is there an official bug list I can search/report a bug? Searched msdn but could not find.

TIA,
Mike

[Pirate]

It is probably a bug . that's what I though then . There are a lot of bugs in this version and in the promising version as well that called VS.NET2003 . Let me see if I can find some of them.

[Pirate]

They are increasing day by day , week by week , product by product .

[Mike Hildner]

Thanks, Pirate, appreciate your help. Always fun to learn something new and never know if it's my code or not. Keeps me busy anyway........

[Pirate]

No problem dude ! Did you find similar problem on the list ?

[Mike Hildner]

No, could not find on either list. The jelovic site has an email link to report a bug, which I'm writing up now.

One might think that Microsoft has an official site for these kind of things, but then again, thinking usually gets me in trouble.

[rudvs2]

okay use the dropdown style

but to ensure only entrys on the list get used place in some auto search code ps maybe also a lil bit of validation

the code i use for the purpose is as follows

Private Sub comboBox1_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles cmbProdCat.KeyUp
        AutoComplete_KeyUp(comboBox1, e)
End Sub

Public Sub AutoComplete_KeyUp(ByVal cbo As ComboBox, ByVal e As KeyEventArgs)
        Dim sTypedText As String
        Dim iFoundIndex As Integer
        Dim sFoundText As String
        Dim sAppendText As String
        Select Case e.KeyCode 'allow select keys without auto completing
            Case Keys.Back, Keys.Left, Keys.Right, Keys.Up, Keys.Delete, Keys.Down
                Return
        End Select
        'get the typed text and find it in the list
        sTypedText = cbo.Text
        iFoundIndex = cbo.FindString(sTypedText)
        'if the typed text is found then auto complete
        If iFoundIndex >= 0 Then
            sFoundText = cbo.Items(iFoundIndex)
            sAppendText = sFoundText.Substring(sTypedText.Length)
            cbo.Text = sTypedText & sAppendText
            cbo.SelectionStart = sTypedText.Length
            cbo.SelectionLength = sAppendText.Length
        Else
            cbo.SelectedIndex = 0
        End If
End Sub 

[Pirate]

hmm , Is this going to solve dropdown list problem , coz I had similar to that problem too !

[josh.kodroff]

I experienced a similar error - when I add an item to the combobox's datasource, the display in the collection turns to "AssemblyName.ClassName". Here's how I overcame the bug:

cmbStudyTracks.DataSource = Nothing
cmbStudyTracks.DataSource = _studyTracks
cmbStudyTracks.DisplayMember = "Name"
cmbStudyTracks.ValueMember = "ID"

Works fine now.