BUG Different Behavior 1.0 / 1.1 - combobox datasource

[Jean-Pierre GUILLERON]

I have encountered a different behavior beetween
Framework 1.0 and compact framework 1.1

Basically, I display a dataview in a combobox.
cb.datasource = Dataview
The behavior is different under 1.1, the dataview is not
displayed anymore.
I tried many things. And finally, I found a solution.
(give hereafter an exemple).
If you execute it in 1.0 and 1.1 you'll find a different
behavior.
This means the ascending/descending compatibility is not
garanteed.


Please help, thanks

'Incompatibility beetween Framework 1.0 and Compact
FrameWork 1.1 while processing combobox/dataview
'form with 2 combobox and one textbox

Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
'Create Datatable with standard VB Sample
Dim dt As DataTable = DemonstrateDataTable()
dt.TableName = "Usine"
'Create Dataview
Dim dv As New DataView
dv = New DataView(dt)
dv.Sort = "ProductID"
'Create Dataset
Dim ds As New DataSet("Produits")
ds.Tables.Add(dt)

'Bind TextBox
txtUsine.DataBindings.Clear()
' Binds a TextBox control to a column in the
DataSet.
txtUsine.DataBindings.Add("Text",
ds, "Usine.ProductName")

'Bind First Combobox with DS
cbDS.DataBindings.Clear()
cbDS.BeginUpdate()
cbDS.Sorted = True
' Bind a Combobox control to a column in the
DataSet.
cbDS.DataBindings.Add("DisplayMember",
ds, "Usine.ProductName")
cbDS.DataSource = ds.Tables("Usine")
cbDS.DisplayMember = "ProductName"
cbDS.ValueMember = "ProductID"
cbDS.EndUpdate()

'Standard code given in the VB.Net documentation
cbDV.BeginUpdate()
cbDV.Sorted = True
'Load the DataView in the combobox datasource -
WITHOUT BINDING.
cbDV.DataSource = dv
cbDV.DisplayMember = "ProductName"
cbDV.ValueMember = "ProductID"
cbDV.EndUpdate()

'Trace
'It Works !
Debug.WriteLine("cbDS Count : " &
cbDS.Items.Count)
'Working with Framework 1.0, It doesn't Works
with Compact Framework 1.1
Debug.WriteLine("cbDV Count : " &
cbDV.Items.Count)

End Sub

Private Function DemonstrateDataTable() As DataTable
Dim myTable As DataTable
myTable = New DataTable

' add columns
Dim column As DataColumn
column = myTable.Columns.Add("ProductID", GetType
(Integer))
column.AutoIncrement = True
column = myTable.Columns.Add("ProductName",
GetType(String))

' populate DataTable.
Dim id As Integer
For id = 1 To 5
myTable.Rows.Add( _
New Object() {id, String.Format("product
{0}", id)})
Next id

Dim dv As DataView
dv = New DataView(myTable)

Return myTable
End Function

 

[JP Guilleron]

I've found the solution.

The difference beetween Fx1.0 and fx1.1 is the following :
FX1.0 : You may load many times the combobox.datasource
without any problem.
FX1.1 : You have to load the combobox.datasource only
once, else when you reload a combobox.datasource not
empty the combobox.datasource change to nothing and it
will be possible to change the datasource, only after
redraw the control.