ComboBox & AddNew problem

  • Thread starter Thread starter Mika M
  • Start date Start date
M

Mika M

Hello!

I have Windows Forms application form containing TextBoxes, six ComboBoxes,
and DataGrid for details. I have created DataSet with needed tables, and
created relations between tables, and bound controls to datatables.

Everything is working almost fine including saving data, but when I press
'New' - button ...

thisCurrencyManager.EndCurrentEdit()
thisCurrencyManager.AddNew()
cboComBo1.SelectedIndex = -1
cboComBo2.SelectedIndex = -1
cboComBo3.SelectedIndex = -1
cboComBo4.SelectedIndex = -1
cboComBo5.SelectedIndex = -1
cboComBo6.SelectedIndex = -1

....to add new entry, only ComboBoxes 3 to 6 are moving to .SelectedIndex
= -1, but ComboBoxes 1 and 2 to .SelectedIndex = 0 ?!?

QUESTION: Why not these ComboBoxes 1 and 2 are not moving to .SelectedIndex
= -1 too (when AddNew) ?


- All these six ComboBoxes are populated like this same way ...

daArticleTypes = New OleDbDataAdapter(New OleDbCommand("SELECT ID,
ArticleType, Description FROM ARTICLE_TYPES", cnn))
daArticleTypes.Fill(ds, "ArticleTypes")

- Even their source table in database is quite similar ...

ID AutoNumber int
ArticleType nvarchar
Description nvarchar

.... only 'ArticleType' - field has another name in other database tables
because all those tables are storing other kind of basic list.


- All ComboBoxes are bound like this same way ...

cboCombo1.DataSource = ds.Tables("ArticleTypes")
cboCombo1.DisplayMember = "ArticleType"
cboCombo1.ValueMember = "ID"
cboCombo1.DataBindings.Add("SelectedValue", ds, "Products.ArticleTypeID")


- I show ToolTip for the user by the following way in every ComboBoxes ...

Private Sub cboCombo1_SelectedIndexChanged(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles cboCombo1.SelectedIndexChanged
Dim cb As ComboBox = CType(sender, ComboBox)

If cb.SelectedIndex > -1 Then
ToolTip1.SetToolTip(cb,
ds.Tables("ArticleTypes").Rows(cb.SelectedIndex).Item("Description").ToStrin
g)
Else
ToolTip1.SetToolTip(cb, Nothing)
End If
End Sub

Hopefully you understand what I'm trying to ask :)
 
Hi Mika,

Set a breakpoint immediately after cbocombo1.selectedindex = -1 just to see
if it goes to -1 (empty) for an instant; if this is the case (I'm guessing
it is), then it is code that follows this code that is resetting combos 1
and 2 to another index.

HTH,

Bernie Yaeger
 
Set a breakpoint immediately after cbocombo1.selectedindex = -1 just to
see
if it goes to -1 (empty) for an instant; if this is the case (I'm guessing
it is), then it is code that follows this code that is resetting combos 1
and 2 to another index.
Click to expand...

Hello Bernie, and thank you for your reply!

Yes I tried that already, but it's not the reason for the problem. I tried
to create 'ArticleTypes' - table into DataSet using SELECT-sql query of the
other working ComboBox, and then it was working ok, except using wrong
database table :'(.

Weird because source tables in database are identical, except
'ArticleType'-Column Name is not same, but field types and properties are.
I'm using MS SQL 2K version 8.00.760 database. I think there's something
weird with database.
HTH,
Click to expand...
What does this abbreviation means? Here in Finland we don't have much
abbreviations. In fact our words are quite long :)

-- Mika
 
Hi Mika,

HTH means 'hope this helps'.

OK, let's see - is the field name 2 words? If it is, you should bracket it
([....]) in the select. Also, try another field from the table in question;
any field, just to see if it's the field or the table that's causing the
problem.

Can you send me an .xml of the tables in question? If you can, I would try
to replicate the conditions on my system.

HTH,

Bernie
 
Hello Bernie, and thank you for your reply again!

Today I noticed when I pressed 'New'-button twice, then those two problem
ComboBoxes also changed to

..SelectedIndex = -1.

In this case when adding new, DataAdapters Update will insert one empty line
and one with forms data into databases parent/master table. Then I added two
lines for these problem ComboBoxes like ...

thisCurrencyManager.EndCurrentEdit()
thisCurrencyManager.AddNew()
cboCombo1.SelectedIndex = -1
cboCombo1.SelectedIndex = -1
cboCombo2.SelectedIndex = -1
cboCombo2.SelectedIndex = -1
cboCombo3.SelectedIndex = -1
cboCombo4.SelectedIndex = -1
cboCombo5.SelectedIndex = -1
cboCombo6.SelectedIndex = -1

.... well, this is not very clever way to solve this :) but it works - but
why like this way ?!?

In fact I have also 6 x Grid components on the separate TabPages in the
bottom of the same form for the details (maybe too many for same form, I
have to think this solution again). Pressing once 'New'-button AddNew causes
that 3 Grid components clears, but when 'New'-button again then all grids
are empty - but like few lines above mentioned - DataAdapters Update will
insert one empty line and one with forms data into databases parent/master
table. Any ideas how to try to solve this?
 
Hi Mika,

No, I wouldn't do that - you're creating empty rows, and that will surely
get you into trouble down later on. I would rather suggest that you go back
to the original code and work with one combobox and one column at a time
until you identify the problem.

Sorry I don't have any better ideas.

Bernie
 
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