Question

Two combo boxes having same dataSource

Asked by: evansong

I have one combo box in out in the field and the other one in datagrid.  And they are both using same dataSource, displaymember, and value member.
Whenever I change  something from either one, they both get effect.
How do I make each one individual so that they don't get effect by changes on the other?

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Asked On
2003-09-18 at 13:30:41ID20742873
Tags

two

Topic

.NET

Participating Experts
3
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300
Comments
11

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Answers

 

by: mondayblueboyPosted on 2003-09-18 at 13:37:21ID: 9389297

Q: what did you change?

 

by: evansongPosted on 2003-09-18 at 13:41:30ID: 9389320

The one in datagrid.
The combo box outside the datagrid has selectedvalue to dataset, and one in the datagrid does not.
But they all has same value member and datasource.

 

by: evansongPosted on 2003-09-18 at 13:43:06ID: 9389333

If I change combo box outside the datagrid, nothing happens.
If I change the combo box inside the datagrid, the outside combo box's value also get to change.

 

by: morphinexPosted on 2003-09-18 at 13:46:56ID: 9389357

Must they both be connected to the datasource?  You could just redo one of the combobox to add each item from the datasource to the combobox's object collection...
ie

say datasource is a dataset...

dim drDataRow as DataRow

For each drDataRow in myDataSet.Table(0)
     ComboBox1.Items.Add(drDataRow("Field").ToString())
Next

 

by: morphinexPosted on 2003-09-18 at 13:48:35ID: 9389366

Can you show us how you are binding both combo boxes?

 

by: mondayblueboyPosted on 2003-09-18 at 13:50:07ID: 9389386


Sorry forgot to ask, you're referring to .NET Windows Application right?

 

by: evansongPosted on 2003-09-18 at 13:54:57ID: 9389422

''''''''''''''This is one inside the datagrid''''''''''''''''''
''''''Start''''''
Private Sub grdSynonyms_CurrentCellChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles grdSynonyms.CurrentCellChanged
            If grdSynonyms.CurrentCell.ColumnNumber = 2 Then
                cmb_Sy_Species.Visible = True
                cmb_Sy_Species.Width = 0
                cmb_Sy_Species.Left = grdSynonyms.GetCurrentCellBounds.Left
                cmb_Sy_Species.Top = grdSynonyms.GetCurrentCellBounds.Top
                If (Not IsDBNull(grdSynonyms.Item(grdSynonyms.CurrentCell))) Then
                    cmb_Sy_Species.SelectedValue = CType(grdSynonyms.Item(grdSynonyms.CurrentCell), Integer)
                Else
                    cmb_Sy_Species.TabIndex = 0
                End If


    Private Sub grdSynonyms_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles grdSynonyms.Click
            If (Not IsDBNull(grdSynonyms.Item(grdSynonyms.CurrentCell))) Then
                cmb_Sy_Species.SelectedValue = CType(grdSynonyms.Item(grdSynonyms.CurrentCell), Integer)
            Else
                cmb_Sy_Species.TabIndex = 0
            End If
        End If

Private Sub grdSynonyms_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
        If grdSynonyms.CurrentCell.ColumnNumber = 2 Then
            cmb_Sy_Species.Visible = False
            grdSynonyms.Item(grdSynonyms.CurrentCell) = CType(cmb_Sy_Species.SelectedValue, Integer)
        End If
''''End''''



''''''''''''''''''This is one in outside the datagrid'''''''''''''''''''''''''''
        '
        'editSpecies
        '
        Me.editSpecies.DataBindings.Add(New System.Windows.Forms.Binding("SelectedValue", Me.objdsAncillary, "Ancillary.species"))
        Me.editSpecies.DataSource = Me.objdsAncillary.Species
        Me.editSpecies.DisplayMember = "Standard_Name"
        Me.editSpecies.Location = New System.Drawing.Point(128, 232)
        Me.editSpecies.Name = "editSpecies"
        Me.editSpecies.Size = New System.Drawing.Size(224, 21)
        Me.editSpecies.TabIndex = 70
        Me.editSpecies.ValueMember = "ID"

 

by: evansongPosted on 2003-09-18 at 14:07:26ID: 9389500

Hi  mondayblueboy,
Yes it is NET Windows Application.

 

by: morphinexPosted on 2003-09-18 at 14:51:54ID: 9389757

It's difficult to tell what is wrong with the code... but I'd venture some guesses and ask a couple more questions!

"cmb_Sy_Species", on selected index change would change the "currentCell" of "grdSynonyms."  Since you didn't give the entire sub procedure for "grdSynonyms" in the above pasted code, it might be possible that on currentCell change, you are also changing the selectedValue for "editSpecies.

On that, could you give the other handlers for "grdSynonyms", "editSpecies", and "grdSynonyms" please?

It looks like you are hiding cmb_sy_species on and off... and that the combobox is completely independent of the datagrid.  Is it a combobox layered onto of the datagrid?   If so, consider trying out the sample project I linked from the other topic you created.


 

by: rinze_catsPosted on 2003-09-19 at 02:03:03ID: 9392033

HI, your problem is discussedhere: http://www.dotnet247.com/247reference/msgs/33/165776.aspx

You can try giving one of your comboBoxes a different bindingcontext using cboMyCombo1.bindingContext = new BindingContext();


cboMyCombo1.DataSource = ds.Tables["somecolumn"];
cboMyCombo1.DisplayMember = "Descrip";
cboMyCombo1.ValueMember = "ID";

cboMyCombo2.DataSource = ds.Tables["somecolumn"];
cboMyCombo2.DisplayMember = "Descrip";
cboMyCombo2.ValueMember = "ID";

cboMyCombo1.bindingContext = new BindingContext();

hope this helps
rinze

 

by: evansongPosted on 2003-09-19 at 10:12:39ID: 9394847

Hi rinze_cats,
Yes, this is what I needed.
Thank you ^^

20120131-EE-VQP-002

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